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Method for switching group users in mobile-relay system

A mobile relay and group user technology, applied in the field of mobility management, can solve the problems of increased probability of dropped calls, lack of mature implementation solutions, increased handover delay, etc., so as to reduce data loss and reduce the probability of user dropped calls , the effect of reducing the switching delay

Inactive Publication Date: 2010-01-13
SHENZHEN TINNO MOBILE TECH CO LTD
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AI Technical Summary

Problems solved by technology

When a single user is handed over, the target eNB can know the data forwarding situation in advance through step 308, but when there is a large amount of user data waiting to be forwarded, if this forwarding and caching method is still used, the SN information of a large amount of UE data will be greatly reduced. Increase the complexity of the algorithm, thereby increasing the delay of switching, and greatly increasing the probability of dropped calls
Especially for some real-time services (such as VoIP), it may lead to a serious decline in service quality
[0007] At present, there is no mature implementation solution in the existing technology for the switching of group users, especially in terms of the continuity of data forwarding, the problem of no packet loss and no repeated packets has not been solved

Method used

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  • Method for switching group users in mobile-relay system
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  • Method for switching group users in mobile-relay system

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[0031]

[0032]

[0033] The current access point ID is the MRN cell ID or the eNB cell ID. When the UE data is forwarded by the MRN, the current access point is the MRN, and the ID is the MRN cell ID; when the UE data is directly forwarded by the eNB, the current access point The entry point is the eNB, and the ID is the eNB cell ID. In the same cell, a cell radio network identifier C-RNTI (Cell Radio Network Temporary Identifier) ​​can be used to uniquely identify a user, and each C-RNTI is 16 bits. The PDCP SN state is divided into uplink UL and downlink DL data forwarding states. In the uplink, only the PDCP SN of the first missing uplink SDU (the PDCP SNof the first missing UL SDU) is recorded, and in the downlink, only the last forwarded downlink SDU is recorded. PDCP SN (the PDCP SN of the last transmitting DL SDU), so that even when the system does not support ARQ / HARQ, it can also complete the correct data forwarding without repetition. The system frame number ...

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Abstract

The invention discloses a method for switching cells of group users in a wireless communication system, relating to the technology of wireless communication. The method comprises the following steps: accessing the group users via a mobile-relay node and establishing a user information list stored in an ACTIVE mode on the mobile-relay node andbase stations, initializing the list when the users establish RRC connection with the mobile-relay node, automatically updating during switching; during switching execution, completing the context synchronization between the source base station and subordinate users of the mobile-relay node via information in the ACTIVE list by a source base station so as to enable users data transmission not to be broken, and reestablishing the context synchronization of the subordinate users by using the information in the ACTIVE list by the mobile-relay node after completing the switching among the base stations. The invention can be used in the mobile-relay system, can realize cross-regional soft switching of the group users and solves the problem of continuity met by the group users during switching.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to mobility management technology of a mobile relay system. Background technique [0002] With the development of mobile communication, three-dimensional coverage is required to meet the increasing demand for coverage and capacity. On the one hand, the future wireless mobile communication system puts forward very high system capacity requirements; on the other hand, large-bandwidth spectrum sufficient to support high capacity may only be found in higher frequency bands, and the path loss and penetration loss of such high frequency bands are large, making it difficult to achieve good coverage. In addition to using technologies such as base station-based OFDMA, MIMO, smart antennas, and transmit diversity to expand coverage, relay technology can also be used to improve system capacity and coverage. [0003] It is well known that the higher the frequency of radio waves, the faster t...

Claims

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Application Information

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IPC IPC(8): H04W8/00H04W36/08H04W36/18H04W92/20
Inventor 唐伦任三阳柴蓉刘宇陈前斌
Owner SHENZHEN TINNO MOBILE TECH CO LTD
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