WO2005117462A1

WO2005117462A1 - Method of resource control and softer handoff in centralized base station

Info

Publication number: WO2005117462A1
Application number: PCT/CN2004/000528
Authority: WO
Inventors: Sheng Liu; Yulin Li
Original assignee: Utstarcom Telecom Co., Ltd.
Priority date: 2004-05-24
Filing date: 2004-05-24
Publication date: 2005-12-08
Also published as: CN100515101C; CN1957623A

Abstract

The invention puts forward a technique of channel process unit transferring, which is to solve the hard handoff problem due to the discontinuity of channel resource in centralized base station. According to the invention, when the situation that needs to perform handoff based on the prior art occurs due to the move of mobile terminal, firstly selecting an appropriate objective channel process unit, then transferring the channel process task form the original channel process unit to the objective channel process unit, thereby avoiding the hard handoff between the different channel process unit so as to permit performing softer handoff process in the objective channel process unit.

Description

Resource control in centralized base stations

Method with softer handover

The present invention relates to the technical field of distributed base stations in mobile communication systems, and in particular, to a method for performing system resource control and softer handover in a centralized base station system using radio frequency units for remote control. technical background

In a mobile communication system, a base station (BTS) completes the transmission, reception, and processing of wireless signals. Traditional BTS mainly consists of a baseband processing subsystem, a radio frequency (RF) subsystem, and an antenna. A BTS can cover different antennas through multiple antennas. A cell (cell) is shown in Fig. 1 (a); and each BTS is connected to a base station controller (BSC) or a radio network controller (RNC) through a certain interface, thereby forming a radio access network (RAN) As shown in Figure 1 (b).

Figure 2 shows the system structure of another distributed base station, that is, a centralized base station using radio frequency units. Compared with traditional base stations, this centralized base station using radio frequency units has many advantages: it allows multiple micro cells to replace a macro cell based on a traditional base station, which can better adapt to different wireless environments and improve the system's Wireless performance such as capacity and coverage; The centralized structure enables soft handover to be completed with softer handover, thereby obtaining additional processing gain; the centralized structure also makes expensive baseband signal processing resources a resource pool shared by multiple cells, Thus, the benefits of statistical multiplexing are obtained, and the system cost is effectively reduced. PCT patent "WO9005432, Communications system"; US patent; i'j "US5657374, Cellular system with centralized base stations and distributed antenna units",

"US6324391, Cellular communication with centralized control and signal processing"; Chinese patent application "CN1471331, "Base station system"; and US patent application "US20030171118, Cellular radio transmission apparatus and cellular radio transmission method" etc. have disclosed the implementation details of this technology.

As shown in Fig. 2, a centralized base station system using a radio frequency unit is mainly composed of a central channel processing subsystem and a remote radio frequency unit (RRIJ) installed in a centralized manner, and they are connected through a broadband transmission link or network. The central channel processing subsystem is composed of functional units such as channel processing resource pool and signal routing and distribution unit, and BSC / RNC interface unit. The BSC / RC interface unit is responsible for the user plane and signaling plane processing of the BTS and BSC / RNC interface. The channel processing resource pool is formed by stacking multiple channel processing units to complete baseband signal processing and other tasks. The signal distribution unit is based on each Different cell traffic (Traffic), dynamically allocate channel processing resources to achieve effective sharing of multi-cell processing resources. In addition to being implemented inside the central channel processing subsystem as shown in Figure 2, the signal routing and distribution unit can also be implemented outside the central channel processing subsystem. The remote radio frequency unit is mainly composed of functional units such as a radio frequency power amplifier of a transmitting channel, a low noise amplifier of a receiving channel, a duplexer, and an antenna. The link between the central channel processing subsystem and the remote RF unit can typically use optical fiber, copper cable, microwave and other transmission shields; the signal transmission method can be a sampled digital signal or a modulated analog signal; the signal can be used Baseband signal, intermediate frequency signal or radio frequency signal.

As mentioned above, the baseband signal processing resource pool in a centralized base station can be shared by multiple cells to obtain the benefits of statistical multiplexing. However, in actual systems, it is limited by factors such as the scale of the integrated circuit and the board, and the complexity of the system. The composition of baseband signal processing resources of a large-scale centralized base station is always discontinuous, that is, its baseband signal processing resources are composed of multiple relatively independent channel processing units. The so-called independence means that they each complete Signal processing tasks for the respective channels without internal signal interconnection. In fact, due to the limitation of the processing capacity of each channel processing unit, when the scale of the RRU that the centralized base station can support is large, the radio signals of all RRUs are It is not practical to be able to switch to each channel processing unit at the same time. At the same time, it is difficult to switch all the RRU wireless signals to each channel processing unit at the same time due to the limitation of the signal routing and distribution unit and the complexity of the system. Therefore, the number of RRIJ signals that can be simultaneously processed by each channel processing unit is always limited, that is, not all wireless signals corresponding to the RUs of the centralized base station can be simultaneously switched to a certain channel processing unit.

Taking Figure 3 as an example, the centralized base station can support a total of M RRUs, and its baseband signal processing resource pool is composed of N relatively independent channel processing units, which are exchanged by the signal routing and distribution unit to each channel processing unit's RRU. The number of signals is K (KδM), that is, although signals of M RRUs can be exchanged to each channel processing unit, only signals of a maximum of RK RRUs are allowed to be exchanged to one channel processing unit at the same time.

On the other hand, in a mobile communication system, when a mobile terminal moves beyond the coverage area of its serving cell, its wireless interface needs to switch to a new cell to ensure that the call is not interrupted. In a code division multiple access (CDMA) system, In the same frequency, the handover process is typically implemented using soft handover and softer handover technologies. Different from the simple handover from one cell to another, soft handover and softer handover allow mobile terminals to maintain communication with more than one cell at the same time, that is, allow mobile terminals to maintain multiple wireless links at the same time. After communication in the cell, the wireless link with the original cell is disconnected, thereby effectively reducing the handover failure rate and obtaining a soft handover gain in terms of system capacity and coverage. The difference between soft handover and softer handover is that softer handover is completed by using RAKE diversity reception in the base station, and soft handover is completed by using selective diversity technology in BSC / RNC. High switching gain.

As described above, the baseband signal processing resources of a large-scale centralized base station are composed of multiple relatively independent channel processing units, and each channel processing unit can only process a certain number of RRU signals at the same time. When the mobile terminal sends When the RRU radio signals corresponding to the cell involved in the raw handover can be exchanged to the same channel processing unit, the existing technology, such as RAKE diversity reception, can be used to achieve softer handover. However, when the RRU wireless signals corresponding to the cell involved in the handover of the mobile terminal cannot be exchanged to the same channel processing unit due to the limitation of the number of RRU signals of the channel processing unit, the relative independence of different channel processing units makes it difficult to adopt RAKE. Diversity reception and other technologies to achieve softer handover. On the other hand, the interface between the centralized base station and BSC / RNC logically supports only one user plane data channel, and traditional soft handover technology is implemented in BSC / RNC. Therefore, When the above situation occurs, it will be difficult to implement a soft handover operation in the prior art and forced to adopt a hard handover technology.

Taking FIG. 4 as an example, a centralized base station is composed of three relatively independent channel processing units # 1, # 2, and # 3, where each channel processing unit allows a maximum of three RRU wireless signals to be processed simultaneously. Assume that the channel processing units # 1, # 2 reach the maximum number of RRU wireless signals within a certain time, that is, the RRU signals corresponding to the cells Cl, C2, and C3 are exchanged to the channel processing unit # 1, and the cells C4, C5, and C6 correspond to RRU signals are exchanged to channel processing unit # 2, and RRU signals corresponding to cells C7, C8, and C9 are exchanged to channel processing unit # 3. As shown in the figure, a mobile terminal follows the path Aii B (i C (i> D moves, it is not difficult to see that when the mobile terminal moves from C1 to C2, the channel processing unit # 1 will be responsible for softer handover processing. However, when moving from C2 to C6, since cell C6 corresponds to The RRU signal can no longer be exchanged to the channel processing unit # 1, so based on the existing technology, the mobile terminal can only be hard-switched to the cell C6, and the corresponding signal processing is performed by the channel processing unit # 2. Similarly, the C6 to C5 Both C7 and C8 can use softer handover technology, but moving from C5 to C7 requires hard handover.

Since the hard handover technology cannot obtain the gains of soft handover and softer handover, it will adversely affect the wireless performance of the system. Therefore, the present invention proposes an effective solution to the above problem, which can be applied to support soft handover. Switching technology CDMA (Code Division Multiple Access) mobile communication systems, such as IS-95, WCDMA, CDMA2000 and other systems. Summary of the invention

As mentioned earlier, because the baseband signal processing resources of a large-scale centralized base station are composed of multiple relatively independent channel processing units, and each channel processing unit can only process a certain number of RRU signals at the same time, Therefore, when the RRU radio signals corresponding to the cell involved in the handover of the mobile terminal cannot be exchanged to the same channel processing unit due to the limitation of the number of RRU signals of the channel processing unit, in order to maintain a single user plane interface between the centralized base station and the BSC / RNC The data channel requires hard handover in the prior art, so the gain of soft handover and softer handover cannot be obtained, thereby adversely affecting the wireless performance of the system.

For this reason, the present invention proposes a channel processing unit migration technology to solve the above-mentioned hard handover problem caused by discontinuity of baseband signal processing resources in the large-scale centralized base station. According to the present invention, when the above-mentioned situation that a hard handover is required due to the movement of a mobile terminal occurs, an appropriate destination channel processing unit is first selected, and then the channel processing task of the mobile terminal is changed from its original location. The channel processing unit is migrated to the destination channel processing unit, thereby avoiding hard handover between different channel processing units and allowing softer handover processing in the destination channel processing unit.

According to the present invention, a method for resource control and softer handover in a centralized base station is provided. The centralized base station (BTS) includes: a remote radio frequency unit (RRU), a signal routing and distribution unit, a plurality of channel processing units, and a BSC / RNC interface unit, wherein the BSC / RNC interface unit is externally connected to BSC / RNC (base station controller / radio network controller), and the method includes steps: the BSC / RNC makes a decision to add a wireless link to a mobile terminal; selection A destination channel processing unit to be migrated; and performing a migration operation of the channel processing unit of the mobile terminal to channel the channel of the mobile terminal The processing task is migrated from the original channel processing unit to the destination channel processing unit.

In the above method, the processing task includes completing, on the destination channel processing unit, processing of physical channels corresponding to all wireless links of the mobile terminal and softer handover diversity processing. BRIEF DESCRIPTION OF THE DRAWINGS

The drawings included in this description and forming a part of this description, together with the general description given above, are used to illustrate embodiments of the present invention. The detailed description of each embodiment is given below to explain the principle of the present invention, where:

Figures 1 (a) and 1 (b) are a schematic diagram of a traditional BTS structure and a radio access network structure, respectively;

Figure 2 is a schematic diagram of the structure of a centralized base station system using a radio frequency unit; Figure 3 is a schematic diagram of the structure of a centralized base station channel processing resource and wireless signal exchange;

4 is a schematic diagram of channel processing resources of a centralized base station;

Fig. 5 is a block diagram of a handover process based on a channel processing unit migration technology; Figs. 6) and 6 (b) are schematic diagrams of timing relationships of a channel processing unit migration process. detailed description

First, the description of the centralized base station system using the radio frequency unit will be described. As shown in FIG. 2, a centralized base station system using a radio frequency unit is mainly composed of a centrally installed central channel processing subsystem and a remote radio frequency unit (RRU), which are connected through a broadband transmission link or network. The central channel processing subsystem is composed of functional units such as channel processing resource pool and signal routing and distribution unit, and BSC / RNC interface unit. The BSC / RC interface unit is responsible for completing the BTS and BSC / RNC interface. User plane and signalling plane processing. The channel processing resource pool is formed by stacking multiple channel processing units to complete tasks such as baseband signal processing. The signal distribution unit dynamically allocates channel processing resources according to the traffic of each cell. Realize effective sharing of multi-cell processing resources. In addition to being implemented inside the central channel processing subsystem as shown in FIG. 2, the signal routing and distribution unit can also be implemented outside the central channel processing subsystem. The remote radio frequency unit is mainly composed of functional units such as a radio frequency power amplifier of a transmitting channel, a low noise amplifier of a receiving channel, a duplexer, and an antenna. The link between the Zhonglai channel processing subsystem and the remote radio frequency unit can typically use optical fiber, copper cable, microwave and other transmission media; the signal transmission method can be a sampled digital signal or a modulated analog signal; the signal can be used Baseband signal, intermediate frequency signal or radio frequency signal.

As mentioned above, the baseband signal processing resource pool in a centralized base station can be shared by multiple cells to obtain the benefits of statistical multiplexing. However, in the actual system, it is limited by the scale of the integrated circuit and the board, and the complexity of the system. The composition of baseband signal processing resources of a large-scale centralized base station is always discontinuous, that is, its baseband signal processing resources are composed of multiple relatively independent channel processing units. The so-called independence means that they each complete Signal processing tasks for the respective channels without internal signal interconnection. Due to the limitation of the processing capability of each channel processing unit, when the RRU supported by the centralized base station is large, it is not practical to exchange the wireless signals of all RRUs to each channel processing unit at the same time. It is difficult to exchange all the wireless signals of all RRUs to each channel processing unit at the same time due to the limitation of the complexity of the routing allocation unit and the system. Therefore, the number of RRU signals that can be simultaneously processed by each channel processing unit is always limited. That is to say, not all radio signals corresponding to the RRUs of the centralized base station can be simultaneously exchanged to a certain channel processing unit. Switching process based on channel processing unit migration technology The clear channel processing unit migration technology solves the hard handover problem caused by the discontinuity of baseband signal processing resources in the large-scale centralized base station. According to the present invention, when the above-mentioned situation that a hard handover is required due to the movement of a mobile terminal occurs, an appropriate destination channel processing unit is first selected, and then the channel processing task of the mobile terminal is changed from its original location. The channel processing unit is migrated to the destination channel processing unit, thereby avoiding hard handover between different channel processing units and allowing softer handover processing in the destination channel processing unit.

The switching process based on the channel processing unit migration technology of the present invention is described in detail below.

According to the present invention, the switching process based on the channel processing unit migration technology is shown in FIG. 5. According to the prior art, the BSC / RNC makes a decision to add a wireless link to a mobile terminal based on the measurement results of wireless parameters such as pilot strength, path loss of the wireless channel, and signal-to-interference ratio. Then, the BSC / RNC passes the BTS through The interface sends a signaling message to the BTS (hereinafter referred to as a centralized base station) to add a wireless link. When the BTS receives the message, the BTS performs corresponding message processing, and then the BTS will determine the corresponding wireless link. Whether the wireless signal of the RRU can be routed to the channel processing unit to which the mobile terminal currently belongs. If the BTS determines that the wireless signal of the RRU corresponding to the newly added wireless link can be routed to the channel processing unit to which the mobile terminal currently belongs, The channel processing unit to which the mobile terminal currently belongs completes the processing of the physical channels corresponding to all wireless links of the mobile terminal and the softer handover diversity processing without the need for channel processing unit migration; otherwise, it is necessary to select a destination channel processing unit to be migrated, The selection of the destination channel processing unit should meet at least the following conditions: The unit has sufficient channel processing resources, and allows the corresponding RRIJ signals of all cells in the active set of the mobile terminal (that is, the set of cells corresponding to all wireless links communicating with the mobile terminal simultaneously) to the channel processing unit without exceeding The maximum number of RRU signals that can be processed; if a destination channel processing unit that meets the conditions can be found, The migration operation, so that the processing of the physical channels corresponding to all wireless links of the mobile terminal and the softer handover diversity processing are completed on the destination channel processing unit, and

The BSC / RNC sends a radio link addition success message; otherwise, the BTS sends a radio link addition failure message to the BSC / RNC without performing any handover operation.

It is not difficult to see that after adopting the channel processing unit migration technology proposed by the present invention, all handovers in the cells controlled by the centralized base station are completed by softer handover, thereby improving the wireless performance of the system, and because the BSC / RNC does not The softer handover process in the centralized base station needs to be controlled, so there is no need to change the existing protocol specifications and system architecture. Channel processing unit migration process and timing relationship

First of all, there are at least two typical methods for when wireless links added during soft handover or soft handover are activated. One is the synchronization method, that is, the BSC / RNC adds signaling to the wireless link. The message specifies the start time (indicated by the wireless frame number) of starting the newly added wireless link. The other is an asynchronous method, that is, the BSC / RNC does not specify the specific time to enable the newly added wireless link. The BTS itself determines, but all of these methods are applicable to the present invention.

According to the present invention, a timing relationship of a channel processing unit migration process is shown in FIG. 6 (a), that is, in the above-mentioned switching process based on the channel processing unit migration technology, once a target channel processing unit that meets the conditions is found, channel processing is started. Unit migration process. First, allocate corresponding processing resources in the destination channel processing unit and configure corresponding channel processing parameters of all wireless links of the mobile terminal, and exchange RRTJ signals corresponding to each wireless link of the mobile terminal to the destination channel processing unit. Note that the present invention does not limit the sequence of these two operations; then, in the first radio frame before the start time of a new wireless link designated by BSC / RNC or determined by BTS, the original channel processing unit should The channel processing context (Context) corresponding to each wireless link of the mobile terminal will be transferred to the destination channel processing unit, where the channel Processing context refers to the historical data used in channel processing; finally, in

The BSC / RNC designates or initiates the channel processing of the mobile terminal by the destination channel processing unit for a new wireless link at the start time of the mobile terminal, and stops the channel processing of the mobile terminal by the original channel processing unit and releases the corresponding channel Processing resources.

In fact, since the channel coding and interleaving processing of the physical layer is based on the transmission time interval (TTI) (one TTI is one or more radio frames), the uplink and downlink channel processing is also performed by the TTI. The channel processing is relatively independent. However, the actual multipath channel is a continuously changing channel with a certain correlation time, so there may be a certain relationship between the baseband signal processing between different TTIs. For example, in a wideband code division multiple access (WCDMA) system, channel estimation in uplink baseband processing typically uses a pilot interpolation algorithm of multiple adjacent time slots, and the channel estimation at the beginning of each TTI needs to use the previous TTI Other examples of the pilot data at the end include the timing of each multipath in the RAKE receiver, and the TPC command received by the uplink. Therefore, in the migration process of the channel processing unit, the historical data in the original channel processing unit needs to be moved to the destination channel processing unit.

As shown in FIG. 6 (a), a square in the figure represents a TTI length. At the Nth TTI, corresponding processing resources are allocated in the destination channel processing unit and corresponding channel processing parameters of all wireless links of the mobile terminal are configured. And exchange the RRU signal corresponding to each wireless link of the mobile terminal to the destination channel processing unit; in the last radio frame of the N + K th TTI, the corresponding wireless link of the mobile terminal in the original channel processing unit corresponds to The channel processing context will be transferred to the destination channel processing unit; at the beginning of the N + K + 1 TTI, the channel processing of the mobile terminal by the destination channel processing unit is started, and the channel processing of the mobile terminal by the original channel processing unit is stopped and released. Corresponding processing resources in this unit.

According to the present invention, the timing relationship of another channel processing unit migration process is shown in FIG. 6 (b). The previous part of the process is the same as the channel processing unit migration process shown in FIG. 6 (a). There are two differences: First, the corresponding channel processing context of each wireless link of the mobile terminal in the original channel processing unit is transferred to the destination channel processing unit, and the TTI that starts the channel processing of the mobile terminal by the destination channel processing unit is BSC / A TTI specified by the RNC or determined by the BTS for a period of time before the start time of the newly added wireless link; second, after the channel processing of the mobile terminal by the destination channel processing unit is started, the channel processing of the mobile terminal in the original channel processing unit Still going on, thereafter

In the time between the start of the newly-added wireless link designated by the BSC / RNC or the BTS, only the channel processing result of the mobile terminal performed by the original channel processing unit is selected, and the mobile performed by the destination channel processing unit is ignored. The channel processing result of the terminal only selects the channel processing result of the mobile terminal that is executed by the destination channel processing unit only after the start time of the new wireless link specified by the BSC / RNC or determined by the BTS arrives. After that, the original channel processing unit stops the channel processing of the mobile terminal and releases the corresponding processing resources in the unit.

As shown in FIG. 6 (b), at the Nth TTI, the corresponding processing resources are allocated in the destination channel processing unit and the corresponding channel processing parameters of all wireless links of the mobile terminal are configured, and each wireless link of the mobile terminal is allocated. The corresponding RRU signals are exchanged to the destination channel processing unit. In the last radio frame of the N + K th TTI, the corresponding channel processing context of each wireless link of the mobile terminal in the original channel processing unit will be transferred to the destination channel. Processing unit; The channel processing of the mobile terminal by the destination channel processing unit is started at the beginning of the N + K, + 1 TTI, and the channel processing of the mobile terminal by the original channel processing unit is still continued; at the N + K, + l TTI to N + K th TTI, only the channel processing result of the mobile terminal performed by the original channel processing unit is selected and the channel processing result of the mobile terminal performed by the destination channel processing unit is ignored; +1 TTI is the start time of the new wireless link designated by the BSC / RNC or determined by the BTS, then the channel location of the mobile terminal executed by the destination channel processing unit is selected. As a result, thereafter, the original letter t channel processing unit handles the mobile terminal stops, the cell corresponding processing resources to be released. Therefore, the channel processing unit migration technology according to the present invention solves the problem of hard handover caused by discontinuity of baseband signal processing resources in a large-scale centralized base station. According to the present invention, when the above-mentioned situation that a hard handover is required due to the movement of a mobile terminal occurs, an appropriate destination channel processing unit is first selected, and then the channel processing task of the mobile terminal is changed from its original location. The channel processing unit is migrated to the destination channel processing unit, thereby avoiding hard handover between different channel processing units and allowing softer handover processing in the destination channel processing unit.

The above description describes the method for system resource control and softer handover in a centralized base station system using a radio frequency unit of the present invention, but the scope of the present invention is not limited to the specific details and typical embodiments shown and described herein . Based on the above description and the accompanying drawings and claims, those skilled in the art should understand that various changes can be made thereto without departing from the spirit and scope of the invention as defined by the following claims and their equivalents. Change, modification and change.

Claims

Rights request

1. A method for resource control and softer handover in a centralized base station, the centralized base station (BTS) comprising: a remote radio frequency unit (RRU), a signal routing and distribution unit, a plurality of channel processing units, and a BSC / RNC interface unit The BSC / RNC interface unit is connected to a BSC / RNC (base station controller / radio network controller), and the method includes the following steps:

BSC / RNC makes a decision to add a radio link to a mobile terminal; selects a destination channel processing unit to be migrated; and

The migration operation of the channel processing unit of the mobile terminal is performed to migrate the channel processing task of the mobile terminal from the channel processing unit where the mobile terminal was originally located to the destination channel processing unit.

2. The method according to claim 1, wherein the processing task comprises performing, on the destination channel processing unit, processing of physical channels corresponding to all wireless links of the mobile terminal and softer handover diversity processing.

3. The method according to claim 1, wherein the selection of the destination channel processing unit should satisfy the following conditions: the destination channel processing unit has sufficient channel processing resources, and allows the mobile terminal to actively concentrate the corresponding RRUs of all cells. Handshake to this channel processing unit without exceeding its maximum number of RRU signals that can be processed.

4. The method according to claim 1, wherein the migration operation of the mobile terminal channel processing unit comprises:

Exchange the RRU signals corresponding to each wireless link of the mobile terminal to the destination channel processing unit;

In the last radio frame of the first transmission time interval (TTI) before the start time of a new wireless link, the corresponding channel processing context of each wireless link of the mobile terminal in the original channel processing unit is transferred to the destination channel A processing unit; starting a destination channel processing unit for Channel processing of mobile terminals.

5. The method according to claim 4, further comprising allocating corresponding processing resources in a destination channel processing unit and configuring corresponding channel processing parameters of all wireless links of the mobile terminal.

6. The method according to claim 4, wherein the start-up time is specified by BSC / RC or determined by BTS.

7. The method according to claim 4, further comprising, when starting the channel processing of the mobile terminal by the destination channel processing unit, stopping the channel processing of the mobile terminal by the original channel processing unit and releasing the corresponding processing in the unit. Resources.

8. The method according to claim 1, wherein the migration operation of the mobile terminal channel processing unit comprises:

In the last radio frame of a TTI for a period of time before the start of a new wireless link, the corresponding channel processing context of each wireless link of the mobile terminal in the original channel processing unit will be transferred to the destination channel processing unit And start the channel processing of the mobile terminal by the destination channel processing unit, where after the channel processing of the mobile terminal by the destination channel processing unit is started, the channel processing of the mobile terminal in the original channel processing unit is still performed;

During the time between the arrival of the newly added wireless link start time, only the channel processing result of the mobile terminal performed by the original channel processing unit is selected, and the channel processing result of the mobile terminal performed by the destination channel processing unit is ignored. And only when the start time of the newly added wireless link arrives, the channel processing result of the mobile terminal executed by the destination channel processing unit is selected.

9. The method according to claim 8, further comprising allocating corresponding processing resources in a destination channel processing unit and configuring channel processing parameters corresponding to all wireless links of the mobile terminal.

10. The method according to claim 8, wherein the start-up time is specified by a BSC / RNC or determined by a BTS.

11. The method according to claim 8, further comprising, after selecting a channel processing result of the mobile terminal executed by the destination channel processing unit, stopping the channel processing of the mobile terminal by the original channel processing unit and releasing the corresponding one in the unit. Processing resources.

12. The method according to claim 4 or 8, wherein the transmission time interval is one or more radio frames.