Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 38641-2020 English PDF

Q: How long will the true-PDF of English version of GB/T 38641-2020 be delivered?

Upon your order, we will start to translate GB/T 38641-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of GB/T 38641-2020_English with my colleagues?

Yes. The purchased PDF of GB/T 38641-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Q: Does the price include tax/VAT?

Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

US$1449.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 38641-2020: Information technology - Telecommunications and information exchange between systems - Media access control and physical layer specifications for low power wide area network
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38641-2020	1449	Add to Cart	8 days	Information technology - Telecommunications and information exchange between systems - Media access control and physical layer specifications for low power wide area network	Valid

Similar standards

GB/T 37685 GB/T 37684 GB/T 38322 GB/T 38637.2 GB/T 38637.1

Basic data

Standard ID: GB/T 38641-2020 (GB/T38641-2020)
Description (Translated English): Information technology - Telecommunications and information exchange between systems - Media access control and physical layer specifications for low power wide area network
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: L79
Classification of International Standard: 35.110
Word Count Estimation: 78,721
Date of Issue: 2020-04-28
Date of Implementation: 2020-11-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies the specifications of the media access control layer and physical layer of the low-power wide area network using NB-IoT technology, including the uplink and downlink physical channels, general processing and procedures of the physical layer, and the protocol format and communication process of the media access control layer. This standard applies to the research and development and design of low-power wide area network related equipment products.

GB/T 38641-2020: Information technology - Telecommunications and information exchange between systems - Media access control and physical layer specifications for low power wide area network

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Information technology - Telecommunications and information exchange between systems - Media access control and physical layer specifications for low power wide area network ICS 35.110 L79 National Standards of People's Republic of China Telecommunication and information exchange between information technology systems Low-power wide area network media access control layer and Physical layer specification 2020-04-28 released 2020-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Preface Ⅲ 1 Scope 1 2 Terms and definitions, abbreviations 1 2.1 Terms and definitions 1 2.2 Abbreviations 1 3 Overview 3 4 Physical layer 3 4.1 Uplink physical channel 3 4.2 Downlink physical channel 16 4.3 Physical layer general processing 28 4.4 Physical layer process 28 5 MAC layer 47 5.1 MAC protocol format 47 5.2 MAC process 57 5.3 Variables and constants 70 References 73 Telecommunication and information exchange between information technology systems Low-power wide area network media access control layer and Physical layer specification

1 Scope

This standard specifies the media access control layer and physical layer specifications of the low-power wide area network using NB-IoT technology, including the upper Downlink physical channels, general processing and procedures, media access control layer protocol format and communication procedures. This standard applies to the research and development and design of low-power wide area network related equipment products. 2 Terms and definitions, abbreviations 2.1 Terms and definitions The following terms and definitions apply to this document. 2.1.1 Anchorcarrier The user equipment receives the NPSS/NSSS/SIB-NB carrier. 2.2 Abbreviations ---Type field T. Marks whether the MAC subheader contains a random access preamble ID or backoff indication. It is set to 0, which means sub-header Contains the backoff indication BI field; set to 1, indicating that the subheader contains the RAPID random access preamble ID field. ---Reserved field R. reserved bit, set to 0 by default. ---Backoff indication field BI. The length is 4 bits, indicating that the cell is in an overload state. ---RAPID field of random access preamble identification. the length is 6 bits, which identifies the sent random access preamble (see 5.2.1.3), Corresponds to the beginning of the subcarrier index. For the random access process with 1.25kHz subcarrier spacing, indicate the random access preamble The identification field of the group, and RAPID=floor (subcarrier index/3). Both the MAC header and the sub-header are byte aligned. Note. The random access preamble identification field corresponds to the beginning of the subcarrier index. 5.1.2.3 MAC payload of random access response The MAC payload length of the random access response is fixed and contains the following fields. ---R domain. reserved bit, set to "0"; ---Time advance command field. the length is 11 bits, indicating the index value TA(0,1,2, , 1282) (see 4.4.1.2); ---Uplink authorization field. 15 bits in length, indicating the resources used for uplink transmission (see 4.4.3.4); ---Temporary C-RNTI field. The length is 16 bits, indicating the temporary C-RNTI used by the UE in the random access process; ---Subcarrier identification field. its value is (subcarrier index mod3) 1, this field is only available for random access with 1.25kHz subcarrier spacing Effective; the random access to other sub-carrier spacing is set to 0. Note. For random access with 1.25kHz sub-carrier spacing, sub-carrier index=RAPID*3 SubId-1. 5.2 MAC process 5.2.1 Random access process 5.2.1.1 Initialization of random access procedure The initialization of the random access process is triggered by the PDCCH command, the MAC layer, or the RRC layer. During random access, the PDCCH command Or RRC signaling is responsible for specifying the subcarrier index, and the random access process is performed on the anchor carrier. Before the random access process is initialized, the information that needs to be prepared is. ---The available set of PRACH resources nprach-ParametersList in the serving cell. ---For random access resource selection and preamble transmission. ● A PRACH resource mapped to an enhanced coverage level. ● Each PRACH resource contains a set of nprach-NumSubcarrier subcarriers, which can be divided into one or two Group in order to pass nprach-SubcarrierMSG3-RangeStart and nprach-NumCBRA-StartSubcarriers For single/multi-subcarrier Msg3 transmission, see 4.1.4.1.Each group is called a random access preamble in the following process description Code group. 1) The subcarrier is identified by the subcarrier index in the following range. (nprach-SubcarrierOffset,nprach-Subcarri- erOffset nprach-NumSubcarriers-1]; 2) Each subcarrier in the random access preamble group corresponds to a random access preamble. ● When the subcarrier index is explicitly sent from the eNB as part of the PDCCH order, the ra-PreambleIndex should be set Set to the sub-carrier index sent by signaling. ---The mapping of PRACH resources to the enhanced coverage level is determined according to the following conditions. ● The number of enhanced coverage levels is equal to the number of RSRP thresholds in rsrp-ThresholdsPrachInfoList plus one. ● Each enhanced coverage level contains PRACH resources in nprach-ParametersList. ● The enhanced coverage levels are numbered from 0, and the mapping of PRACH resources to enhanced coverage levels is numRepetition- sPerPreambleAttempt is completed in increasing order. ---The criterion for selecting PRACH resources for each enhanced coverage level based on RSRP measurement in the serving cell is rsrp- ThresholdsPrachInfoList. ---The maximum number of preamble transmission attempts for each enhanced coverage level supported in the serving cell is maxNumPreambleAt- temptCE. ---The number of repetitions required for the preamble transmission of each enhanced coverage level supported in the serving cell is numRepetitionPerPre- ambleAttempt. ---The transmit power for the UE in the serving cell to perform the random access procedure is PCMAX,c. Among them, PCMAX, c is determined by the maximum transmit power of the UE The rate level PPowerClass and the allowable UE maximum transmit power P-Max of the network configuration are determined by information. ---The RA response window size for each enhanced coverage level supported in the serving cell is ra-ResponseWindowSize and competition The resolution timer is mac-ContentionResolutionTimer (only serving cell). ---The power ramping factor is powerRampingStep. ---The maximum number of preamble transmission is preambleTransMax-CE. ---The initial preamble power is preambleInitialReceivedTargetPower. ---The offset DELTA_PREAMBLE based on the preamble format is set to 0. Random access processing flow. ---Clear the Msg3 cache; ---Set PREAMBLE_TRANSMISSION_COUNTER to 1; ---Set PREAMBLE_TRANSMISSION_COUNTER_CE to 1; ---If the initial number of NPRACH repetitions has been indicated by the PDCCH instruction initiating the random access procedure, or if the initial The enhanced coverage level has been provided by the upper layer. ● Regardless of the measured RSRP value, the MAC entity considers itself to be at this enhanced coverage level; ---otherwise. ● If the upper layer configures the RSRP threshold of enhanced coverage level 2 in rsrp-ThresholdsPrachInfoList, and measures If the RSRP is less than the RSRP threshold of enhanced coverage level 2, and the UE can support enhanced coverage level 2, then. ---MAC entity considers to be at enhanced coverage level 2; ● Otherwise, if the measured RSRP is less than the enhanced coverage configured by the higher layer in rsrp-ThresholdsPrachInfoList, etc. If the RSRP threshold of level 1, the MAC entity considers it to be at enhanced coverage level 1. ---Otherwise, the MAC entity considers it to be at enhanced coverage level 0; ---Set the backoff parameter value to 0ms; ---Continue to select random access resources (see 5.2.1.2). Note 1.MAC entity has only one random access process in progress at any point in time. If the MAC entity is in progress during a random access process When receiving a request for a new random access process, it is up to the UE to decide whether to continue the ongoing process or restart the random access process. Note 2.The UE only performs RSRP measurement on the anchor carrier. 5.2.1.2 Random access resource selection The random access resource selection process is carried out as follows. ---If the random access preamble ra-PreambleIndex and PRACH resources have been explicitly indicated, then ● The PRACH resource adopts the explicitly indicated resource; ● If the indicated ra-PreambleIndex is not 000000. ● Otherwise. ---Select the random access preamble group according to PRACH resources and multi-subcarrier Msg3 transmission support capabilities. If not saved In the multi-subcarrier Msg3 random access preamble group, the UE supporting multi-subcarrier Msg3 should only select single subcarrier Msg3 random access to the preamble group; --- Randomly select the random access preamble in the selected group. ---Otherwise, the random access preamble shall be selected by the MAC entity as follows. ● The MAC entity should select the PRACH resource corresponding to the selected enhanced coverage level, and based on the PRACH resource and multiple subcarriers The wave Msg3 transmission support capability selects the corresponding random access preamble group. If there is no multi-subcarrier Msg3 random connection In the preamble group, the UE supporting the multi-subcarrier Msg3 should only select the single subcarrier Msg3 to randomly access the preamble group. ● If Msg3 is retransmitted, the MAC entity should select the preamble transmission corresponding to the first transmission used for Msg3 Try the same random access preamble group. ● Randomly select the random access preamble in the selected group, and the random function satisfies each allowed option to be selected with equal probability. ---Determine the next available subframe containing PRACH allowed by the restrictions given by the physical layer timing requirements, and The subframe occupied by PRACH resources related to the coverage level (the MAC entity shall determine the next available PRACH subframe Taking into account the measurement gap that may occur). ---Select the ra-ResponseWindowSize and mac-ContentionRes corresponding to the selected enhanced coverage level and PRACH- olutionTimer. ---Continue to transmit the random access preamble (see 5.2.1.3). 5.2.1.3 Random access preamble transmission The random access process proceeds as follows. --- Instruct the physical layer to use the preamble transmission repetition number numRepetitionPerPre corresponding to the selected preamble group requirements ambleAttempt, the preamble group is determined according to the PRACH resource corresponding to the selected enhanced coverage level, and Corresponding RA-RNTI, subcarrier index and PREAMBLE_RECEIVED_TARGET_POWER before sending Code. 5.2.1.4 Random access response reception Once the random access preamble is sent, regardless of whether there is a measurement gap, the MAC entity should listen to the specific small in the RA response window. PDCCH to receive the random access response. In the case that the number of NPRACH repetitions is greater than or equal to 64, the RA response window is Contains the end of the last preamble repetition plus 41 subframes, and uses the ra-Re- corresponding to the enhanced coverage level. sponseWindowSize window length; in the case where the number of NPRACH repetitions is less than 64, the RA response window contains the last Start at the end of the preamble repetition plus 4 subframes, and use the ra-ResponseWindow- corresponding to the enhanced coverage level Size window length. The RA-RNTI associated with the PRACH sending the random access preamble is calculated according to equation (57). RA-RNTI=1 floor(SFN_id/4) (57) Among them, SFN_id is the index of the first radio frame specifying NPRACH. The MAC entity successfully receives the random access containing the random access preamble identifier that matches the sent random access preamble After the response, the MAC entity stops monitoring the random access response. Next, the MAC entity performs the following steps. ---If the downlink allocation for this TTI has been received on the PDCCH used for RA-RNTI, and the received If the TB is successfully decoded, the MAC entity will regardless of whether there is a measurement gap. ● If the random access response contains a backoff indicator subheader, set the backoff according to the BI field of the backoff indicator subheader and Table 65 Parameter value; ● Otherwise, set the backoff parameter value to 0ms; ● If the random access response contains the random access preamble identifier corresponding to the sent random access preamble (see 5.2.1.3), the MAC entity shall. ---It is considered that the random access response is received successfully, and the following operations are performed on the serving cell that sends the random access preamble. ● Process the received timing advance command (see 5.2.2); ● Increased power for the latest access preamble transmission Down to the bottom; ● Process the received UL authorization value and indicate it to the lower layers. Note 1.When uplink transmission is required, such as contention resolution, eNB should not provide authorization less than 88 bits in the random access response. Note 2.In the random access process, the uplink authorization provided for the same set of random access preamble in the random access response has The first uplink grant allocated during the process is of different size, the UE behavior is not defined. If no random access response is received within the random access response window, or if all received random access responses do not contain The random access preamble identifier corresponding to the sent random access preamble, the random access response reception is considered unsuccessful, MAC The entity should. ---If you do not receive a power-up suspension notification from the lower layer. ● Increase PREAMBLE_TRANSMISSION_COUNTER by 1; ---If PREAMBLE_TRANSMISSION_COUNTER=preambleTransMax-CE 1. ● If the random access preamble is transmitted on a specific cell. --- Instruct the upper layer to random access problems; ---Think that the random access process failed; ---If during this random access process, the random access preamble is selected by MAC. ● Based on the backoff parameter, select the random backoff time according to the uniform distribution between 0 and the backoff parameter value; ● Delay subsequent random access transmission by backoff time; ---Increase PREAMBLE_TRANSMISSION_COUNTER_CE by 1; ---Increase the corresponding enhanced coverage level by 1, if PREAMBLE_TRANSMISSION_COUNTER_CE=max- NumPreambleAttemptCE. ● Reset PREAMBLE_TRANSMISSION_COUNTER_CE; ● If supported by the serving cell and UE, enter the next enhanced coverage level, otherwise stay at the current enhanced coverage level; ● If the random access process is initiated by the PDCCH command. ---Select the PRACH resource corresponding to the selected enhanced coverage level; --- Treat the selected PRACH resource as an explicit indication; ---Continue to select a random access resource (see 5.2.1.2). 5.2.1.5 Competition Resolution The contention resolution is based on the C-RNTI on the PDCCH of the specific cell or the UE contention resolution identifier on the DL-SCH. Once Msg3 is sent, the MAC entity should perform the following actions. ---Start mac-ContentionResolutionTimer, and in the subframe containing the last repetition of the corresponding PUSCH transmission Restart mac-ContentionResolutionTimer every time HARQ retransmission is performed. ---Monitor PDCCH until mac-ContentionResolutionTimer expires or stops. ---If a notification that PDCCH transmission has been received is received from the lower layer, the MAC entity shall. ● If the C-RNTIMAC control unit is included in Msg3. ---If the random access process is initiated by the MAC layer itself or by the RRC sublayer, and the PDCCH transmission is by C-RNTI Address and contain an uplink grant for the new transmission, or ---If the random access procedure is initiated by the PDCCH command and the PDCCH transmission is addressed by the C-RNTI. ● Think that the competition is successfully resolved; ● Stop mac-ContentionResolutionTimer; ● Discard temporary C-RNTI; ● It is considered that the random access process has been successfully completed. ● Otherwise if CCCHSDU is included in Msg3 and PDCCH transmission is addressed by temporary C-RNTI; ---If the MACPDU is successfully decoded. ● Stop mac-ContentionResolutionTimer; ● If the MACPDU contains the UE contention resolution identification MAC control unit; and ● If the UE contention resolution identification included in the MAC control unit is the same as the CCCH sent in Msg3 The first 48 bits of the SDU match. ---Consider the successful resolution of the competition, and complete the disassembly and demultiplexing of MACPDU; ---Set C-RNTI to the value of temporary C-RNTI; ---Discard the temporary C-RNTI; ---Considering that the random access process has been successfully completed; ● Otherwise, the temporary C-RNTI is discarded; ● Think that the contention resolution has failed, and discard the successfully decoded MACPDU. ---If mac-ContentionResolutionTimer times out. ● Discard temporary C-RNTI; ● Think that the competition resolution has failed. ---If the contention resolution fails, the MAC entity shall perform the following operations. ● Clear the HARQ buffer used to transmit MACPDUs in the Msg3 buffer; ● If you don't receive the notification of power rise suspension from the bottom layer. ---Increase PREAMBLE_TRANSMISSION_COUNTER by 1; ● If PREAMBLE_TRANSMISSION_COUNTER=preambleTransMax-CE 1. --- Indicate a random access problem to the upper layer; ---Considering that the random access process was not successfully completed; ● Based on the back-off parameter, select the random back-off time according to the uniform distribution between 0 and the value of the back-off parameter; ● Delay the subsequent random access transmission according to the backoff time; ● Continue to select a random access resource (see 5.2.1.2). 5.2.1.6 Random access process completed When the random access process is completed, the MAC entity will clear the HARQ buffer used to transmit MACPDUs in the Msg3 buffer. 5.2.2 Uplink synchronization maintenance The MAC entity should configure a timer timeAlignmentTimer for each TAG to control the MAC entity The uplink time of the TAG-related serving cell is aligned. The MAC entity operates as follows. ---When receiving the time advance command MAC control unit and for the indicated TAG, NTA has been stored or maintained. ● Apply the time advance command to the specified TAG; ● Start or restart the timeAlignmentTimer timer associated with the specified TAG. ---When receiving the time advance command belonging to the TAG serving cell in the random access response message, ......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 38641-2020_English be delivered?

Answer: Upon your order, we will start to translate GB/T 38641-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 38641-2020_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 38641-2020_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.