Base station switchover method

A base station switching, source base station technology, applied in wireless communication, using return channel for error prevention/detection, electrical components, etc., can solve problems such as long delay, occupation, reducing system capacity, etc., and achieve the effect of reducing processing load

Inactive Publication Date: 2009-10-14
ZTE CORP
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Problems solved by technology

[0004] However, the shortcomings of the base station forwarding solution are: the process of forwarding all PDUs in the ARQ buffer will generate a long delay, and increase the processing load of the source base station
The disadvantage of the multicast method is that the mechanism for judging which data has been sent to the UE after the handover is complicated, and additional target cell resources are occupied during the multicast process, which greatly reduces the system capacity

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Embodiment Construction

[0025] In the embodiment of the present invention, first place the ARQ entity and the ARQ first-level cache in the MAC (Medium Access Control) layer in the base station, and place the ARQ entity and the ARQ primary buffer in the PDCP (Packet Data Convergence Protocol) in the access gateway. layer) to set the ARQ secondary cache. The content of the ARQ secondary cache is the IP packet after header compression, i.e. the PDCP PDU. The content in the ARQ primary cache is MAC PDU, and the MAC PDU has two data composition methods: 1), The original PDCP service data unit SDU appends or does not append MAC header information. In this case, the MAC PDU and PDCP PDU have a 1-to-1 relationship; 2), the PDCP SDU is concatenated / segmented according to a fixed length, and then the MAC header is appended or not appended In this case, the relationship between the MAC PDU and the PDCP PDU is 1-to-many, many-to-1 or many-to-many. The capacity of the ARQ L2 cache is equal to or slightly larger t...

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Abstract

This invention discloses a base station switching method including: setting the automatic repeat request L1 cache in the media access control layer of base station and the L2 one in the Packet Data Access Gateway convergence protocol layer, and installing the switching preparation and decision threshold in the measurement module. When the measurement report from source base station to judge user' s equipment reaches the switching preparation threshold, it maintains the synchronization of two-level cache. When the measurement report reaches the switching decision threshold, it sends to the target base station the protocol data unit of packet data convergence protocol layer in L2 cache, and carries completing signs on the final packet. The target base station receives the above data unit in the L1 cache, and deals with them to be media accessing to the control layer protocol data unit. After completing the corresponding treatments, the target station requires to access Gateway to carry switching operation.

Description

technical field [0001] The present invention relates to a base station switching method, in particular to a base station switching method completed by processing ARQ (automatic repeat request, automatic repeat request) in the third generation mobile communication long-term evolution system. Background technique [0002] In the long-term evolution system of the third-generation mobile communication, a mechanism combining an upper-layer ARQ entity and a lower-layer HARQ (Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request) entity is used on the user plane to achieve reliable transmission. When the ARQ entity is located at the base station, in the case of base station handover, currently known mobility management solutions include base station forwarding and multicasting. [0003] The working principle of the base station forwarding mode is: when the source base station judges that the UE (User Equipment, user equipment) measurement report reaches the handover deci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W36/02H04W36/08H04L1/18H04W36/30
Inventor 张健
Owner ZTE CORP
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