LTE (long term evolution) broadcast multicast repeat method

A broadcast, multicast and retransmission technology, applied in the direction of broadcast service distribution, transmission system, digital transmission system, etc., can solve the problems of data packet confirmation, MBMS service reliability, etc., and achieve the effect of less system overhead

Inactive Publication Date: 2015-04-29
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

No matter whether the UE in RRC_IDLE or the UE in RRC_CONNECTED receives the data transmitted by MBMS, it will not confirm the data packet, and the UE in RRC_IDLE cannot give feedback
[0027] In the existing

Method used

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  • LTE (long term evolution) broadcast multicast repeat method
  • LTE (long term evolution) broadcast multicast repeat method
  • LTE (long term evolution) broadcast multicast repeat method

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[0046] The present invention will be further described with reference to the drawings.

[0047] figure 1 It is a schematic diagram of transmission in the existing LTE technology. One MBMS session sends data to multiple UEs at the same time. When the MBMS session starts, the UE may be in the idle state RRC_IDLE, or may be in the connected state RRC_CONNECTED. When the UE is in the RRC_IDLE state, there is no need to initiate random access to make the UE enter the RRC_CONNECTED state, that is, in the RRC_IDLE state, it can directly receive the data transmitted by MBMS. Regardless of whether it is the UE in the RRC_IDLE state or the UE in the RRC_CONNECTED state, when receiving the data transmitted by MBMS, the data packet is not confirmed, and the UE in the RRC_IDLE state cannot perform feedback.

[0048] 1. In special application scenarios, reliable broadcast and multicast services need to be provided to multiple UEs to ensure that each UE can receive broadcast and multicast conte...

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Abstract

The invention relates to an LTE (long term evolution) broadcast multicast repeat method. The method comprises steps as follows: 1, an eNB (evolved Node B) caches data of broadcast multicast, a timer is started, cached data waits for a time T, each set of UE (user equipment) in RRC_IDLE or RRC_CONNECTED performs normal reception operation of broadcast multicast business and performs correct verification on received data packages, processing is not performed if reception is correct, and if an error occurs to reception, NACK (negative acknowledgement) is required to be replied, and the eNB is informed of the repeat data package with an error; 2, if the timer of the eNB is overtime and a repeat request of the UE is not received, the cache data are deleted, and all sets of UE are considered to have received data correctly; 3, after the eNB receives the error data package repeated by the UE, corresponding processing is performed according to user states. According to the method, only when an error occurs to transmission, the UE sends a repeat request to the eNB, and lower system expense is guaranteed while reliable communication of broadcast multicast is guaranteed.

Description

technical field [0001] The invention relates to a broadcast multicast retransmission method in LTE (Long Term Evolution, long term evolution). Background technique [0002] Acronyms and key term definitions: [0003] ACK Acknowledgment, confirmation [0004] AM Acknowledged Mode, non-acknowledged mode [0005] C-RNTI Cell Radio Network Temporary Identifier, cell wireless network temporary identifier [0006] DL-SCH DownLink Shared Channel, downlink shared channel [0007] eNB evolved Node B, evolved base station [0008] HARQ Hybrid Automatic Repeat reQuest, hybrid automatic repeat request [0009] MAC Medium Access Control, media access control [0010] MAC PDU Medium Access Control Protocol Data Unit, protocol data unit [0011] MAC CE Medium Access Control Control Element, MAC Control Unit [0012] MBMS Multimedia Broadcast / Multicast Service, multimedia broadcast multicast service [0013] MCS Modulation and Coding Scheme, modulation and coding scheme [0014] M...

Claims

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Application Information

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IPC IPC(8): H04L1/18H04W4/06H04W74/08
CPCH04L1/1848H04L1/1607H04W4/06H04W74/0833
Inventor 吴伟民赖静袁永亮刘芳秦梦
Owner HUAZHONG UNIV OF SCI & TECH
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