WO2005122610A1 - A method of allocating the centralized bs resource and routing signal - Google Patents

A method of allocating the centralized bs resource and routing signal Download PDF

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Publication number
WO2005122610A1
WO2005122610A1 PCT/CN2004/000623 CN2004000623W WO2005122610A1 WO 2005122610 A1 WO2005122610 A1 WO 2005122610A1 CN 2004000623 W CN2004000623 W CN 2004000623W WO 2005122610 A1 WO2005122610 A1 WO 2005122610A1
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Prior art keywords
channel processing
processing unit
wireless link
channel
cell
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PCT/CN2004/000623
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French (fr)
Chinese (zh)
Inventor
Sheng Liu
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Utstarcom Telecom Co., Ltd.
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Priority to PCT/CN2004/000623 priority Critical patent/WO2005122610A1/en
Publication of WO2005122610A1 publication Critical patent/WO2005122610A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/16Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/18Negotiating wireless communication parameters
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic or resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/08Load balancing or load distribution
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management, e.g. wireless traffic scheduling or selection or allocation of wireless resources
    • H04W72/04Wireless resource allocation

Abstract

The present invention provides a method of allocating the channel resource in the centralized BS, concluding: selecting the optimum channel processing unit respectively for each radio link newly added so that all the channel processing that relates to each radio link newly added is performed respectively in the corresponding optimum channel processing unit. The present invention also provides a method of dispatching the resource adaptively and balancing the load on the basis of complimenting the channel resource allocation, and a centralized base station that can realize the above channel resource allocating method .Accordingly, to each radio link newly added (concluding the link established newly and added due to the macro diversity), which can be allocated to a optimum channel processing unit and be processed, thereby realizing the maximum of using the channel processing resource.

Description

 Resource allocation for centralized base stations

 AND SIGNAL ROUTING METHODS TECHNICAL FIELD

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

 Overview of centralized base station

 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).

FIG. 2 shows the system structure of another distributed base station, that is, a centralized base station that uses a radio frequency unit to extend the distance. 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 ^ "US5657374, Cellular system with centralized base stations and distributed antenna units", "US6324391, Cellular communication with centralized control and signal processing "; Chinese patent application" CN1471331, a base station system for mobile communication, "and US patent application" US20030171118, Cellular radio transmission apparatus and cellular radio transmission method "etc. all disclose relevant 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 centrally installed central channel processing main unit (MU) 10 and multiple remote radio frequency units (RRIJ) 20, and a broadband transmission link is used between them. Or network connection, and the BSC / RNC interface unit is responsible for completing the user plane and signaling plane processing of the BTS and BSC / RNC interface. The main unit of the central channel processing is mainly composed of functional units such as a channel processing resource pool and a signal routing and distribution unit. Among them, the channel processing resource pool is formed by stacking multiple channel processing units to complete tasks such as baseband signal processing. The signal routing and distribution unit is based on Different cell traffic (Traffic) to dynamically allocate channel processing resources, so as to achieve effective sharing of multi-cell processing resources. In addition to being implemented inside the MU as shown in Figure 2, the signal routing and distribution unit can also be implemented outside the MU as a separate device. 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, and an antenna. The link between the central channel processing main unit 10 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, IF, or RF signals.

 It is not difficult to see from the foregoing introduction of the prior art that one of the main advantages of a centralized base station is that baseband signal processing resources are made into a resource pool shared by multiple cells, thereby obtaining the benefits of statistical multiplexing and effectively reducing system costs. Therefore, how to effectively allocate channel processing resources is the key to centralized base stations.

2. Channel processing resources and centralized base station structure

In a code division multiple access (CDMA) system, the baseband signal processing resources are mainly composed of A RAKE receiver or other enhanced receiving technologies, such as a chip-level processing unit with multi-user detection (MUD) as the core and a symbol-level processing unit with channel codec processing as the core, are composed of symbol-level processing and user service types. It is closely related to the rate, and chip-level processing is little affected by the user's service type and rate relationship, which is mainly related to the number of service channels.

 In a large-scale base station system supporting multiple sectors and multiple carrier frequencies, the channel processing function typically has two possible structures. One is to integrate the chip-level processing unit and the symbol-level processing unit on a single board. The system consists of multiple configurable channel processing modules. The second is to enable chip-level processing units and symbol-level processing units to be implemented on different boards. That is, the system consists of multiple configurable chip-level processing modules. And symbol-level processing module. Figures 3 and 4 show typical implementation examples of the above two structures.

 In a typical example of a system structure in which a chip-level processing unit and a symbol-level processing unit are integrated as shown in FIG. 3, the system is composed of M independent channel processing modules. The so-called "independent" means that they each complete a corresponding channel. Process tasks without internal signal interconnection. Because there is no internal signal interconnection, the design of the system backplane bus is greatly simplified, which is conducive to the formation of a large-scale centralized base station. Although the independence between modules is not conducive to the effective use of system resources, the existing baseband signals An all-software implementation solution based on a digital signal processor (DSP) or multiple processing unit array structure in parallel has also appeared in the processing solution. Due to the flexibility of the software in the scheduling of processor resources, the structure is greatly reduced. Insufficient use of system resources.

In a typical example of a system structure in which a chip-level processing unit and a symbol-level processing unit are separated as shown in FIG. 4, the system is composed of a chip-level processing module and β symbol-level processing modules. The chip-level processing modules are independent of each other, that is, they each complete the corresponding chip-level processing tasks without internal signal interconnection. Due to the high chip-level processing rate, the chip-level processing modules interconnecting internal signals with each other will cause System structure Hybrid, it is more difficult to apply in large-scale centralized base stations; On the other hand, because the rate is relatively low, the symbol-level processing module allows internal signal interconnection to achieve processing resource sharing, so the symbol-level processing part can be seen Into a continuous single processing module.

 It can be seen that the above two typical implementation structures have the problem of discontinuous channel processing resources. At the same time, in a large-scale centralized base station, due to the limitation of the processing capacity of each channel processing unit, when the centralized base station can support the RRU When the scale is large, it is not practical to exchange the radio signals of all RRUs to each channel processing unit at the same time. At the same time, due to the high data flow rate of wireless signals, and due to the limitation of the signal routing and distribution unit and the complexity of the system, it is difficult to achieve the simultaneous exchange of wireless signals of all RRUs to each channel processing unit. Therefore, each channel The number of RRU signals that can be simultaneously processed by the processing unit is always limited, that is, not all wireless signals corresponding to the RRUs of the centralized base station can be simultaneously exchanged to a certain channel processing unit. Summary of the invention

 Therefore, according to the foregoing analysis of the typical examples of the structure of the channel processing system shown in FIG. 3 and FIG. 4, the problem of allocating channel processing resources in the centralized base station in the prior art can be further reduced to such a problem:

• For each newly added wireless link (including newly established and increased wireless links due to macro diversity), to which channel processing unit should it be allocated for processing, and the RRU of the cell where the wireless link is located should be assigned Wireless signal is routed to this assigned channel processing unit? The channel processing unit corresponds to the channel processing system structure shown in FIG. 3 corresponding to each channel processing module, and the channel processing system structure shown in FIG. 4 corresponds to the chip level. Processing module (Since the symbol-level processing part is a continuous single processing module, the above allocation problem does not exist, and its internal resource scheduling is not considered in the present invention). The present invention proposes an effective solution to the above problems.

 Therefore, an object of the present invention is to provide a method for allocating channel resources in a centralized base station of a wireless communication system. The method includes the following steps:

 The optimal channel processing unit is selected for each newly added wireless link, so that the channel processing related to each newly added wireless link is performed in the corresponding selected optimal channel processing unit, respectively.

 In an embodiment of the channel resource allocation method described above, the method further includes the step of: quantifying each of the new radio resource information using a system's known resource model information according to parameters related to each of the newly added radio links in the access process. The resource occupation amount of the added wireless link, and an optimal channel processing unit is selected for each newly added wireless link based on the quantified resource occupation amount of each newly added wireless link.

 According to a preferred implementation manner of the above channel resource allocation method, in the step of selecting an optimal channel processing unit for each newly added wireless link, the wireless chain that is responsible for processing with each selected optimal channel processing unit is made The cells corresponding to the roads are as close as possible geographically and concentrated in a certain area.

 It can be seen that, according to the foregoing method, an optimal channel processing unit is selected for each newly added wireless link (including newly established and increased wireless links due to macro diversity), and optimization of each channel processing resource in the base station at this point can be achieved. distribution. On this basis, in order to maximize the utilization of channel processing resources, resource scheduling may be performed between the channel processing units according to the medium-to-long-term statistical results of the load of the channel processing unit of the centralized base station to balance the channel processing units. Handling load.

 Therefore, another object of the present invention is to provide a method for performing adaptive resource scheduling and load balancing in a centralized base station of a wireless communication system. The method includes steps:

According to statistics on the load of each channel processing unit in the centralized base station As a result, parameters related to load sharing of each channel processing unit in the system resource model information are adaptively adjusted, so as to achieve adaptive resource scheduling and load balancing of each channel processing unit;

 among them,

 Based on the resource occupation amount determined for each newly added wireless link, an optimal channel processing unit is selected for each newly added wireless link, so that the channel related to each newly added wireless link The processing is performed respectively in the corresponding optimal channel processing unit selected.

 In one embodiment of the above-mentioned adaptive resource scheduling and load balancing method of the present invention, the cells corresponding to the wireless links that are handled by the optimal channel processing unit selected for each newly added wireless link are geographically optimized. May be adjacent and concentrated in a certain area.

 According to a preferred implementation of the foregoing adaptive resource scheduling and load balancing method, for each channel processing unit in a centralized base station, the cells controlled by the centralized base station are divided into corresponding groups of different resource allocation levels. And selecting an optimal channel processing unit for each newly added wireless link according to the resource allocation level of the divided cell set from high to low.

 According to another object of the present invention, a centralized hub for implementing the channel resource allocation method of the present invention is provided. The centralized base station includes:

 Central Channel Processing Main Unit Μϋ;

 Multiple remote radio frequency unit RRUs, which are coupled to the central channel processing main unit MU through a broadband transmission link or network connection;

 The centralized base station further includes

 An optimal channel selection component is configured to select an optimal channel processing unit for each newly added wireless link, so that the channel processing related to each newly added wireless link is respectively selected in the corresponding corresponding optimal channel. In the processing unit.

According to an implementation manner of the foregoing centralized base station according to the present invention, the optimal information The channel selection component is configured to select an optimal channel processing unit for each newly added wireless link based on the resource occupancy of each newly added wireless link quantified using the system's known resource model information. In a preferred embodiment, the optimal channel selection component is configured so that the cells corresponding to the wireless links that each selected optimal channel processing unit is responsible for processing are geographically adjacent as much as possible and concentrated in a certain area. Areas.

 It should be noted that although the present invention is described by taking the CDMA system as an example for the convenience of description, the basic idea, spirit, principle, and method of the present invention are applicable to mobile communication systems of other standards, such as FDMA (Frequency Division Multiple Access). ), TDMA (Time Division Multiple Access), OFDM (Orthogonal Frequency Division Multiplexing), etc. are still applicable.

 As described above, according to the present invention, the allocation of channel processing resources in a centralized base station is decomposed into two relatively independent processes, one is for each newly added wireless link (including newly established wireless links and increased wireless due to macro diversity). Link) to select the optimal channel processing unit; the other is to perform resource scheduling among channel processing units to balance the processing load of each channel processing unit based on the medium-to-long-term statistical results of the channel processing unit load of the centralized base station, This achieves the purpose of maximizing the utilization of channel processing resources. That is to say, the former process can optimize the allocation of channel processing resources in the centralized base station, and the latter process is a further improvement on the former process. BRIEF DESCRIPTION OF THE DRAWINGS

 The detailed description of the specific embodiments of the present invention with reference to the accompanying drawings will make the features and benefits of the present invention more obvious. In the drawings:

 Figure 1 (a) shows a conventional BTS structure;

 Figure 1 (b) shows the structure of a conventional radio access network;

Fig. 2 shows the structure of a centralized base station system using a radio frequency unit; Fig. 3 shows the chip level in the channel processing function part of the prior art base station system. System structure for processing integration with symbol-level processing units;

 FIG. 4 shows a system structure in which chip-level processing and symbol-level processing units are separated in a channel processing function part of a base station system in the prior art;

 FIG. 5 is a schematic diagram of three cell sets of each channel processing unit of a centralized base station according to an embodiment of the present invention; FIG.

 6a shows a schematic flowchart of a radio link optimal channel processing unit selection process implemented in a centralized base station according to an embodiment of the present invention;

 FIG. 6b shows a detailed flowchart of the optimal channel processing unit selection process in FIG. 6a;

 7a illustrates a first case of an embodiment of a channel processing resource adaptive scheduling and load balancing method according to the present invention;

 Fig. 7b shows a second case of an embodiment of a method for adaptive scheduling and load balancing of channel processing resources according to the present invention. detailed description

 The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

 Resource allocation during access

 According to the present invention, when a wireless link is newly added (including a newly established wireless link and increased due to macro diversity), an optimal channel processing unit for performing corresponding channel processing needs to be selected. For this reason, the newly added The wireless link performs resource occupation analysis and evaluation. According to the previous analysis, the centralized base station system resources involved are:

□ Chip-level processing unit resources;

 □ Symbol-level processing unit resources (only for the channel processing system structure shown in Figure 3);

□ Each channel processing unit allows simultaneous processing at most RRU wireless signal channel resources that are exchanged or routed to each channel processing unit; and as previously mentioned, radio links of different rates and service types occupy different chip-level processing resources and symbol-level processing resources. The wireless link that is increased due to macro diversity also occupies system resources. Therefore, it is necessary to quantify each newly added wireless link parameter based on wireless link parameters such as rate, service type, and whether the wireless link is added for macro diversity. The resource occupation amount of the wireless link for analysis and evaluation of resource occupation. In view of the fact that the system resource model information such as the average resource occupancy of various rates and types of services and the structure of channel processing resources is known by the base station, the processing of the optimal channel processing unit selected for corresponding channel processing is actually equivalent to A table lookup operation.

 According to the present invention, the selection of the optimal channel processing unit for each newly added wireless link (including newly established and increased wireless links due to macro diversity) in the access process should follow the following principles: that is, the optimal channel processing unit The selection should occupy as little RRU signal channel resources as possible for each channel processing unit; as far as possible, the RRU wireless signals of the cells where the macro diversity branches are located can be exchanged to the same channel processing unit when soft handover occurs to achieve softer handover. Processing; Minimize cross-channel processing unit handover operations caused by mobile terminals such as handover in different cells.

In fact, when the adopted mobile communication system supports soft handover technology, processing all macro-diversity branches of a mobile terminal at the same time in the same channel processing unit is conducive to reducing the consumption of system processing resources and improving wireless coverage and capacity. performance. Even if the mobile communication system used does not support soft handover technology, such as a TDD (Time Division Duplex) mode CDMA system, if a mobile terminal moves between different cells, the channel processing of its wireless link is still performed in the same channel processing unit. The migration operation of context information related to the mobile terminal between different channel processing units can be reduced, and related parameter configuration in a new channel processing unit can be reduced. Operations such as installation and operation, thereby simplifying the complexity of the system and contributing to the improvement of system stability and reliability.

 According to the above principles, in a preferred embodiment of the present invention, the optimal channel processing unit selection of each newly added wireless link (including newly established and increased wireless links due to macro diversity) in the access process is such that The cells corresponding to the wireless links handled by each channel processing unit are geographically adjacent as much as possible and concentrated in a certain area. In this way, it will help to occupy as little RIOJ signal channel resources as possible for each channel processing unit. Facilitate as much as possible that the RRU radio signals of the cells where the macro-diversity branches are located can be exchanged to the same channel processing unit to improve the radio performance when soft handover occurs; The handover operation of the cross-channel processing unit caused by the mobility process.

 Specifically, a preferred implementation manner of selecting an optimal channel processing unit for each newly added wireless link (including newly created and increased wireless links due to macro diversity) in the access process according to the present invention is as follows .

 First, for each channel processing unit in a centralized base station, the cells controlled by the centralized base station are divided into a corresponding set of cell sets with different resource allocation levels. In this non-limiting preferred example manner, the The cell is divided into three cell sets: a basic cell, a candidate cell, and a remaining cell. Each channel processing unit preferentially processes the business channels of the cells in its basic cell set, followed by the business channels of the cells in the candidate cell set, and finally in the remaining cell set. The traffic channel of the cell. According to the present invention, the following principles should be followed for the classification of a community:

 □ Each cell to which the centralized base station belongs must be in one and only one basic cell set of a channel processing unit. This channel processing unit is called the home channel processing unit of the cell. Therefore, the basic cell set of all channel processing units intersects. It is empty and merges into all cells to which the centralized base station belongs;

. A basic cell is a collection of geographically adjacent cells, so The RRIJ signal channel resources of each channel processing unit are less occupied, which is conducive to making it possible to exchange the RRU wireless signals of the cells where the macro diversity branches are located to the same channel processing unit when soft handover occurs. To achieve softer handovers;

 □ The cells in the candidate cell set of each channel processing unit are the neighboring cells that are geographically adjacent to the cells in the basic cell set of the channel processing unit. Therefore, it is the part of the basic cell set whose geographical coverage is expanded. Overlapping coverage, a cell may be in the candidate cell set of multiple channel processing units at the same time. As described later, the cells in the candidate cell set are candidate cells for load sharing, that is, when a channel processing unit has a surplus of channel processing resources and other channel processing units have a large channel processing load, the channel processing unit may preferentially Provide channel processing resources for cells in its candidate cell set. If the candidate cell set of a channel processing unit includes some cells in the basic cell set of other channel processing units, the channel processing unit is called an adjacent channel processing unit of these channel processing units;

□ Residual cell set is the set of cells belonging to the centralized base station other than the basic cell and the candidate cell. Because the cells in the remaining cell set are geographically far away from the cells processed by their channel processing unit, they may consume excessive RRU signal channel resources and make it harder to implement softer handover processing. Therefore, as described later, only the In extreme cases, it will be the choice for load sharing. Figure 5 shows a schematic diagram of the above three types of cell sets. In this example, the centralized base station has a total of 9 channel processing units, and the basic cell set corresponding to each channel processing unit is shown as D1, D2,... The .D9 area is expanded into the E1, E2, ... E9 areas marked in the figure after adding its corresponding candidate cell set, where each area contains a certain number of geographically adjacent cells. It can be seen that the basic cell set of all channel processing units covers all the cells of the centralized base station. A cell has only one home channel processing unit, but a cell may be in a candidate cell set of multiple channel processing units at the same time.

 6a and 6b are flowcharts of a process of selecting an optimal channel processing unit for a wireless link implemented in a centralized base station according to the preferred embodiment of the present invention. Fig. 6a shows a schematic flow of the optimal channel selection process. As shown in step S50, for each channel processing unit in the centralized base station, the cells controlled by the centralized base station are divided into corresponding groups with different resource allocation levels in the manner shown in FIG. 5. Cell set; in step S60, selecting an optimal channel processing unit for each newly added wireless link according to the resource allocation level of the divided cell set; in step S70, returning a result of the optimal channel selection process, That is, whether the optimal channel processing unit is successfully selected for each newly added wireless link.

Fig. 6b shows the detailed processing flow of steps S60 and S70 in Fig. 6a. As shown in the figure, when the base station receives a new or added wireless link message from the BSC / RNC (step S100), it performs corresponding message processing and obtains parameters such as the wireless link rate and service type, while considering the new wireless link. Link and factors that increase the wireless link, use the system's known resource model information to quantify the resource occupancy of the wireless link (step S110), and simultaneously search for the cell where the wireless link is located and the corresponding RRU signal (step S120); Then determine whether the home channel processing unit of the cell in which it is located can provide sufficient resources (including chip-level processing unit resources, symbol-level processing unit resources, RRU wireless signal channel resources, etc.) for the wireless link (step S130); If the judgment result of step S130 is "No", that is, the home channel processing unit cannot provide the required resources, then all candidate cell sets are searched for in the channel processing unit containing the cell where the wireless link is located (step S140), and then the available resources are selected. In order from high to low, determine whether the corresponding channel processing unit can provide the required resources for the wireless link (step (S150); If the determination result of step S150 is "No", that is, all the channel processing units are still unable to provide the required resources, then determine whether the other channel processing units can be The wireless link provides Supply the required resources (step S160), if a channel processing unit that meets the requirements is still not found, return a wireless link establishment or addition failure message to the BSC / RNC and indicate that the reason for the failure is insufficient processing resources (step S210). In each of the above resource judgments, as long as a channel processing unit that meets the resource requirements is found, subsequent judgments are stopped, and then it is determined whether the RRU radio signal of the cell where the wireless link is located has been routed to the channel processing unit (step S170). Route the RRU wireless signal to the channel processing unit (step S180), then allocate and configure corresponding channel processing resources for the wireless link, update the statistical information of the resource status of the corresponding channel processing unit (step S190), and send the BSC / The RNC returns a message that the radio link is successfully established or added (step S200).

 In the process of selecting the optimal channel processing unit of the wireless link, the home channel processing unit of the cell in which it is located is preferentially selected, which is beneficial to occupying as few RRU signal channel resources of each channel processing unit as possible, and to make soft handover as much as possible. When this occurs, the RRU radio signals of the cells where the macro-diversity branches are located can be exchanged to the same channel processing unit to achieve softer handover processing. When the resources of the home channel processing unit are insufficient, based on the same purpose, the candidate cells should be considered to include the wireless The channel processing unit of the cell where the link is located. This happens mainly due to the large number of active users and traffic in the vicinity of the basic cell where the channel processing unit belongs. Therefore, the adjacent channel processing unit needs to be To share the excessive load, when there are multiple candidate cells that collectively include the channel processing unit of the cell where the wireless link is located and can provide the required processing resources, the channel processing unit with the smallest load is selected to achieve the load balancing of the channel processing unit; The system has a short period of time When the traffic amount of »high extreme case, only the load provided by the non-adjacent sub-channel processing unit supporting process.

Although in order to achieve optimal channel processing unit selection for each newly added wireless link (including newly established and increased wireless links due to macro diversity) in the access process, the specific implementation adopted is to make each channel process The unit handles the wireless The cells corresponding to the links are geographically adjacent as much as possible and concentrated in a certain area. However, those skilled in the art should understand that this preferred specific implementation manner is not intended to limit the technical solution for selecting the optimal channel processing unit of the newly added wireless link in the centralized hub of the present invention. Other embodiments conceivable by those skilled in the art without spending creative labor should also be considered to fall within the protection scope of the present invention. For example, there may be other options for the classification method of the cell set of each channel processing unit, as long as the corresponding classification method is helpful to achieve the optimized resource allocation of the centralized base station described above.

2. Adaptive resource scheduling and load balancing

 According to the present invention, based on the selection of the optimal channel processing unit of the wireless link described above, resource scheduling may be performed between the channel processing units according to the mid-to-long-term statistical results of the load of the channel processing unit in the centralized base station to balance each channel. The processing load of the channel processing unit, thereby achieving the purpose of maximizing the utilization of channel processing resources.

 Therefore, the present invention also provides a method for implementing load balancing of each channel processing unit. According to the method of the present invention, according to the medium-to-long-term statistical results of the load of the channel processing unit of the centralized base station, the cell set based on the load sharing purpose of each channel processing unit is adaptively adjusted. Candidate cell set, so as to achieve the purpose of load balancing of each channel processing unit.

In the first case of a preferred embodiment of the method according to the present invention, the instantaneous load of each channel processing unit in the centralized base station is statistically obtained to obtain the (average) load of each channel processing unit within a certain time range, And the total average load of all channel processing units is obtained by arithmetic average. If the load of a channel processing unit exceeds a certain threshold of the total average, the candidate cell set of adjacent channel processing units of the channel processing unit is appropriately increased. The added cell is a cell in the basic cell set of the channel processing unit that is geographically adjacent to the cell in the candidate cell set of the corresponding adjacent channel processing unit, and each adjacent channel processing unit candidate The increase of the cell set also depends on the respective load, that is, the candidate cell set of the adjacent channel processing unit with the larger load increases less, and the candidate cell set of the adjacent channel processing unit with the smaller load increases more; meanwhile, The candidate cell set of the channel processing unit is appropriately reduced, and the reduction depends on the load of each adjacent channel processing unit, that is, if the load of one of the adjacent channel processing units is large, the candidate cell set in the The reduced cells belonging to the basic channel set of the adjacent channel processing unit are smaller. If the load of one of the adjacent channel processing units is small, the reduced number of cells in the candidate cell set belonging to the basic channel set of the adjacent channel processing unit. There are many communities.

 Fig. 7 (a) is a schematic diagram of the first case. As shown in FIG. 7 (a), a centralized base station includes three channel processing units A, B, and C, respectively corresponding to the basic cells A, B, and C. If the load of the channel processing unit B exceeds a certain average threshold, based on In the above one preferred solution, the candidate cell set of the adjacent channel processing unit and C will increase, and the candidate cell set of the channel processing unit B will decrease. If the load of the channel processing unit A is greater than that of the channel processing unit C, Load, the increase of the candidate cell set of channel processing unit A is smaller than the increase of the candidate cell set of channel processing unit C, and the cells belonging to the basic cell set of channel processing unit A that are reduced in the candidate cell set of channel processing unit B belong more There are many cells in the basic cell set of the channel processing unit C.

In the second case of the preferred embodiment of the method according to the present invention, the instantaneous load of each channel processing unit in the centralized base station is statistically obtained to obtain the (average) load of each channel processing unit within a certain time range. And the total average load of all channel processing units (same as the processing in the first case above), if the load of a channel processing unit is below a certain threshold of the total average, the candidate cell set of the channel processing unit is appropriately increased, The increase depends on the load of each adjacent channel processing unit, that is, if the load of one of the adjacent channel processing units is large, the cells added to its candidate cell set belong to the basic cell set of the adjacent channel processing unit. Less, if the load of one of its adjacent channel processing units is small, its candidate cell set There are many more cells that belong to the basic cell set of the adjacent channel processing unit in the combination. At the same time, the candidate cell set of the adjacent channel processing unit of the channel processing unit is appropriately reduced, and the reduction depends on each adjacent channel. The load of the processing unit, that is, the candidate cell set of the adjacent channel processing unit with a larger load is reduced more, and the candidate cell set of the adjacent channel processing unit with a smaller load is reduced.

 Fig. 7 (b) is a schematic diagram of the second case. A centralized base station includes three channel processing units A, B, and C, which respectively correspond to the basic cells A, B, and C. If the load of the channel processing unit B is lower than a certain threshold of the total average, based on the second preferred solution, The candidate cell set of its adjacent channel processing unit, C will decrease, while the candidate cell set of channel processing unit B will increase. If the load of channel processing unit A is less than the load of channel processing unit (:, then channel processing unit A The reduction amount of the candidate cell set is smaller than the reduction amount of the candidate cell set of the channel processing unit C, and the cells belonging to the basic cell set of the channel processing unit A added to the candidate cell set of the channel processing unit B belong to the channel processing unit C more There are many cells in the basic cell set.

 Those skilled in the art can understand that in the above-mentioned adaptive resource scheduling and load balancing method of the present invention, in addition to the total average load of all channel processing units, the parameters used to determine the degree of load of the channel processing unit may also select other suitable Judgment parameters. For example, the total weighted average load of all channel processing units, or a function of the total average load of all channel processing units, such as aP + b, where a and b are constants, and P is the total average load of all channel processing units; and many more. As for the threshold used when judging that the load of a channel processing unit needs to be adjusted, it can also be set by a technician according to the actual situation.

Although the above two methods of the present invention are preferably implemented by software, it is obvious that these methods can also be implemented by various hardware modules or structures known to those skilled in the art. Therefore, any hardware configuration that implements the above method of the present invention with a known hardware structure or a combination thereof should also be considered to fall within the protection scope of the present invention. For example, a corresponding optimal channel processing unit selection may be set in the centralized base station. A selection component is configured to select an optimal channel processing unit for a newly added wireless link, so as to complete resource optimization allocation in the centralized base station. It is easy to understand that the optimal channel processing unit selection component may be implemented by various well-known function modules, and may be provided in, for example, the MU 10 shown in FIG. 3, or may be provided outside the centralized base station, and so on.

 Although the various technical solutions of the present invention have been described above with reference to specific embodiments, those skilled in the art understand that various improvements or modifications can be made to the present invention without departing from the principle and spirit of the present invention. In short, the scope of protection of the present invention is only determined by the appended claims.

Claims

 1. A method for allocating channel resources in a centralized base station of a wireless communication system, comprising the steps:
 The optimal channel processing unit is selected for each newly added wireless link, so that the channel processing related to each newly added wireless link is performed in the corresponding selected optimal channel processing unit, respectively.
2. The channel resource allocation method according to claim 1, further comprising the step of: quantizing the each of the radio resource information known by the system according to parameters related to each of the newly added wireless links in the access process. The resource occupation amount of each newly added wireless link, and an optimal channel processing unit is selected for each newly added wireless link based on the quantified resource occupation amount of each newly added wireless link.
3. The channel resource allocation method according to claim 1 or 2, wherein:
 In the step of selecting an optimal channel processing unit for each newly added wireless link, the cells corresponding to the wireless link that each selected optimal channel processing unit is responsible for processing are geographically adjacent as much as possible And focus on a certain area.
4. The channel resource allocation method according to any one of claims 1-3, wherein: the step of selecting an optimal channel processing unit for each newly added wireless link in the access process includes the following sub-steps :
 For each channel processing unit in the centralized base station, the cells controlled by the centralized base station are divided into corresponding groups of cell sets with different resource allocation levels;
According to the resource allocation level of the divided cell set, the optimal channel processing unit is selected for each newly added wireless link, and priority is given to the resource allocation level that is high. The cell set is selected. Only when an optimal channel processing unit is not found in a cell set with a high resource allocation level, the optimal channel processing unit is selected in turn from a cell set with a lower resource allocation level.
5. The channel resource allocation method according to claim 4, wherein:
 The set of cells with different resource allocation levels for each channel processing unit includes: a basic cell, a candidate cell, and a remaining cell, where the basic cell is unique to each channel processing unit, and the basic cell sets of all channel processing units intersect The empty union is all the cells to which the centralized base station belongs. For each cell in each basic cell set, the channel processing unit to which it belongs is the home channel processing unit of the cell; the candidate cell set of each channel processing unit The cells in are the neighboring cells that are geographically adjacent to the cells in the basic cell set of the channel processing unit; the remaining cell sets are the other cell sets of the centralized base station other than the basic cell and the candidate cell, and A resource allocation level is assigned to the basic cell, candidate cell, and remaining cell of each channel processing unit in descending order.
6. The channel resource allocation method according to claim 4 or 5, wherein:
 The step of selecting the optimal channel processing unit for each newly added wireless link according to the resource allocation level of the divided cell set includes the following sub-steps:
 After the base station receives the message of newly joining the wireless link, it determines the cell where the wireless link is located and the corresponding remote radio unit RRU wireless signal according to the quantified resource occupation of the newly added wireless link;
Determine whether the home channel processing unit of the cell can provide sufficient resources for the wireless link, and if its home channel processing unit cannot provide the required resources, search all candidate cell sets that include the cell where the wireless link is located The channel processing unit, and then judges the corresponding channel processing order in order from the available resource size from high to low. Whether the unit can provide the required resources for the wireless link. If all the channel processing units still cannot provide the required resources, then it is determined whether the other channel processing units can The wireless link provides the required resources in order to obtain an optimal channel processing unit for the newly added wireless link.
7. The channel resource allocation method according to claim 6, wherein:
 In each judgment of the resource allocation step, as long as an optimal channel processing unit that meets the resource requirements is found, subsequent determinations are stopped. If an optimal channel processing unit that meets the requirements cannot be found in the resource allocation step, the centralized The base station controller / radio network controller BSC / RNC corresponding to the base station returns a radio link establishment or addition failure message and indicates that the cause of the failure is insufficient processing resources; and
 After the resource allocation step obtains an optimal channel processing unit that meets the resource requirements, it is determined whether the wireless signal of the remote radio unit RU of the cell where the wireless link is located has been routed to the optimal channel processing unit, and if not yet routed, the RRU The wireless signal is routed to the channel processing unit, and then the corresponding channel processing resource is allocated and configured for the wireless link. At the same time, the statistical information of the resource status of the corresponding channel processing unit is updated, and the wireless link establishment or addition success is returned to the BSC / RNC. News.
8. The channel resource allocation method according to any one of claims 1 to 7, wherein: the resources that the optimal channel processing unit can provide for a corresponding newly added wireless link include chip-level processing unit resources, symbols Level processing unit resources, RRU wireless signal channel resources.
9. The channel resource allocation method according to any one of claims 2 to 7, wherein the parameter used in the step of quantifying the resource occupation amount of each newly added wireless link includes each newly added wireless link Link speed, traffic type, and wireless link parameters. 10. The channel resource allocation method according to claim 9, wherein the wireless link parameters include a type parameter indicating that the newly added wireless link is a macro diversity-added wireless link or a newly-created wireless link .
11. The channel resource allocation method according to any one of claims 5 to 7, wherein:
 When the optimal channel processing unit is selected for the newly added wireless link in the resource allocation step, when there are multiple candidate cells that collectively include the channel processing unit of the cell where the wireless link is located and can all provide the required processing resources, Then, the channel processing unit with the smallest load drop is selected as the optimal channel processing unit, so as to achieve load balancing of each channel processing unit.
12. A method for adaptive resource scheduling and load balancing in a centralized base station of a wireless communication system, the method comprising the steps:
 According to the statistical results of the load conditions of the channel processing units in the centralized base station, parameters related to the load sharing of the channel processing units in the system resource model information are adaptively adjusted, so as to achieve the adaptive resources of the channel processing units. Scheduling and load balancing;
 among them:
Based on the resource occupation amount determined for each newly added wireless link, an optimal channel processing unit is selected for each newly added wireless link, so that the channel related to each newly added wireless link The processing is performed respectively in the corresponding optimal channel processing unit selected. The adaptive resource scheduling and load balancing method according to claim 12, The cells corresponding to the wireless links that the optimal channel processing unit selected for each newly added wireless link is responsible for processing are geographically adjacent and concentrated in an area as much as possible.
14. The adaptive resource scheduling and load balancing method according to claim 12 or 13, wherein:
 For each channel processing unit in a centralized base station, the cells controlled by the centralized base station are divided into corresponding sets of cell sets with different resource allocation levels; according to the resource allocation level of the divided cell set, from high to low is Each newly added wireless link selects the optimal channel processing unit.
15. The adaptive resource scheduling and load balancing method according to claim 14, wherein:
 A cell set of different resource allocation levels divided for each channel processing unit includes: a basic cell, a candidate cell, and a remaining cell, where:
 The basic cell is unique to each channel processing unit, and the intersection of the basic cell set of all channel processing units is empty and merges into all the cells to which the centralized base station belongs. For each cell in each basic cell set, its belonging The channel processing unit is the home channel processing unit of the cell. The cells in the candidate cell set of each channel processing unit are the geographically neighboring cells in the basic cell set of the channel processing unit. The remaining cell set is A set of other cells belonging to the centralized base station other than the basic cell and the candidate cell, and the resource allocation level is assigned to the basic cell, the candidate cell, and the remaining cells of each channel processing unit in a descending order.
16. The adaptive resource scheduling and load balancing method according to any one of claims 12 to 15, wherein: The step of adaptively adjusting parameters related to load sharing of each channel processing unit in the system resource model information includes sub-steps:
 Comparing a load of a channel processing unit with a predetermined value; and adaptively adjusting parameters of the channel processing unit related to load sharing according to a comparison result.
17. The adaptive resource scheduling and load balancing method according to claim 16, wherein:
 The predetermined value is obtained by at least one of the following methods: statistics of the instantaneous load of each channel processing unit in the centralized base station to obtain an average load of each channel processing unit within a certain time range, and The total average load of all channel processing units obtained by performing arithmetic average on the obtained average load is used as the predetermined value; the total weighted average load of all channel processing units obtained by weighting the obtained average load The quantity is used as the predetermined value; a function aP + b of the total average load of all channel processing units is used as the predetermined value, where a, b are constants, and P is the total average load of all channel processing units.
18. The method for adaptive resource scheduling and load balancing according to any one of claims 15-17, wherein:
 A parameter related to load sharing of the channel processing unit is a size of a corresponding cell set of each of the channel processing units.
19. The adaptive resource scheduling and load balancing method according to any one of claims 16 to 18, wherein:
If the load of the channel processing unit is greater than the predetermined value, the candidate cell set of the adjacent channel processing unit of the channel processing unit is appropriately increased, and at the same time, the Reduce the set of candidate cells for the channel processing unit.
20. The adaptive resource scheduling and load balancing method according to claim 19, wherein:
 The added cell when the load of the channel processing unit is greater than the predetermined value is a cell in the basic cell set of the channel processing unit that is geographically adjacent to a cell in the candidate cell set of the corresponding channel processing unit.
21. The adaptive resource scheduling and load balancing method according to claim 19 or 20, wherein:
 When the load of the channel processing unit is greater than the predetermined value, the increase in the candidate cell set of the adjacent channel processing unit of the channel processing unit depends on the respective load of the adjacent channel processing unit, and the adjacent channel with a larger load The candidate cell set of the processing unit increases less and the candidate cell set of the adjacent channel processing unit with a smaller load increases more.
22. The adaptive resource scheduling and load balancing method according to any one of claims 19-21, wherein:
 When the load of the channel processing unit is greater than the predetermined value, the appropriate reduction of the candidate cell set of the channel processing unit depends on the load of its adjacent channel processing units. If the load of one of its adjacent channel processing units is The larger the number of cells in the candidate cell set that belongs to the basic channel set of the adjacent channel processing unit is smaller, and if the load of one of the adjacent channel processing units is small, the reduction in the candidate cell set belongs to the There are many cells in the basic cell set of the adjacent channel processing unit.
23. The adaptive resource scheduling and load balancing method according to any one of claims 16 to 18, wherein: When the load of the channel processing unit is less than the predetermined value, the candidate cell set of the channel processing unit is appropriately increased, and at the same time, the candidate cell set of the adjacent channel processing unit of the channel processing unit is appropriately reduced.
24. The adaptive resource scheduling and load balancing method according to claim 23, wherein:
 When the load of the channel processing unit is less than the predetermined value, the increase of the candidate cell set of the channel processing unit depends on the load of its adjacent channel processing units. If the load of one of its adjacent channel processing units is large, Then there are fewer cells in the candidate cell set that belong to the basic channel set of the adjacent channel processing unit, and if the load of one of the adjacent channel processing units is small, the additional channel in the candidate cell set belongs to the adjacent channel There are many cells in the basic cell set of the processing unit.
25. The method for adaptive resource scheduling and load balancing according to claim 23 or 24, wherein:
 When the load of the channel processing unit is less than the predetermined value, the reduction amount of the candidate cell set of the adjacent channel processing unit of the channel processing unit also depends on the load of each adjacent channel processing unit. The candidate cell set of the adjacent channel processing unit is reduced more, and the candidate cell set of the adjacent channel processing unit with less load is reduced less.
26. A centralized hub, including:
 The central channel processing main unit MU (10);
 A plurality of remote radio frequency units RRU (20), which are coupled to the central channel processing main unit MIMO through a broadband transmission link or network connection;
 The centralized base station further includes
Optimal channel selection component for selecting each newly added wireless link separately The optimal channel processing unit, so that the channel processing related to each newly added wireless link is performed in the corresponding selected optimal channel processing unit, respectively.
27. The centralized base station according to claim 26, wherein:
 The optimal channel selection component is configured to select an optimal channel process for each newly added wireless link according to the resource occupation amount of each newly added wireless link quantified using system known resource model information. unit.
28. The centralized base station according to claim 26 or 27, wherein:
 The optimal channel selection component is configured such that the cells corresponding to the wireless links that each selected optimal channel processing unit is responsible for processing are geographically adjacent as much as possible and concentrated in a certain area.
29. The centralized base station according to any one of claims 26-28, wherein: the optimal channel selection component comprises:
 A cell set division sub-component, configured to divide each cell controlled by the centralized base station into a corresponding group of cell sets with different resource allocation levels for each channel processing unit in the centralized base station; and
 A channel selection sub-component, configured to select an optimal channel processing unit for each newly added wireless link according to the resource allocation level of the divided cell set, and to preferentially select the cell set with a high resource allocation level, Only when the optimal channel processing unit is not found in a cell set with a high resource allocation level, the optimal channel processing unit is selected in turn from a cell set with a lower resource allocation level.
30. The centralized base station according to claim 29, wherein:
The set of cells with different resource allocation levels for each channel processing unit includes: a basic cell, a candidate cell, and a remaining cell, where the basic cell is unique to each channel processing unit, and the basic cell sets of all channel processing units intersect The empty union is all the cells to which the centralized base station belongs. For each cell in each basic cell set, the channel processing unit to which it belongs is the home channel processing unit of the cell; the candidate cell set of each channel processing unit The cells in are the neighboring cells that are geographically adjacent to the cells in the basic cell set of the channel processing unit; the remaining cell sets are the other cell sets of the centralized base station other than the basic cell and the candidate cell, and A resource allocation level is assigned to the basic cell, candidate cell, and remaining cell of each channel processing unit in order from high to low.
31. The centralized base station according to claim 29 or 30, wherein:
 The channel selection sub-component is configured to:
 Determine whether the home channel processing unit of the cell corresponding to the newly added wireless link can provide sufficient resources for the wireless link. If its home channel processing unit cannot provide the required resources, then search all candidate cell sets Including the channel processing unit of the cell where the wireless link is located, and then sequentially determining whether the corresponding channel processing unit can provide the required resources for the wireless link in the order of the available resource size from high to low. Still unable to provide the required resources, then in order of available resource size from high to low, determine whether other channel processing units can provide the required resources for the wireless link in order to obtain for the newly added wireless link Optimal channel processing unit.
32. The centralized base station according to claim 31, wherein:
 The channel selection sub-component is further configured to:
 In each judgment of the resource allocation, as long as an optimal channel processing unit that meets the resource requirements is found, subsequent judgments are stopped. If the optimal channel processing unit that meets the requirements cannot be found in the resource allocation process, the centralized The base station controller / radio network controller BSC / RNC corresponding to the base station returns a radio link establishment or addition failure message and indicates that the reason for the failure is insufficient processing resources; and
Obtaining an optimal channel processing unit that meets resource requirements in the resource allocation process Then, it is judged whether the RRU wireless signal of the remote radio frequency unit of the cell where the wireless link is located has been routed to the optimal channel processing unit, if not yet routed, the RRU wireless signal is routed to the channel processing unit, and then allocated for the wireless link And configure corresponding channel processing resources, update the statistical information of the resource status of the corresponding channel processing unit, and return a message to the BSC / RNC that the radio link is successfully established or added.
PCT/CN2004/000623 2004-06-10 2004-06-10 A method of allocating the centralized bs resource and routing signal WO2005122610A1 (en)

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