CN102170704B - Uplink multi-cell base station cooperative user scheduling method - Google Patents
Uplink multi-cell base station cooperative user scheduling method Download PDFInfo
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- CN102170704B CN102170704B CN 201110136333 CN201110136333A CN102170704B CN 102170704 B CN102170704 B CN 102170704B CN 201110136333 CN201110136333 CN 201110136333 CN 201110136333 A CN201110136333 A CN 201110136333A CN 102170704 B CN102170704 B CN 102170704B
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Abstract
The invention provides an uplink multi-cell base station cooperative user scheduling method, which belongs to the field of wireless information transmission. When a user terminal on the edge of a cell communicates with a destination serving base station, the terminal may produce interference on the base station of a neighbor cell. The serving base station selects a user with the least interference on the adjacent base station as a communication user by cooperative processing among the base stations, and allocates a timeslot to the user for signal transmission, so interference among the cells is reduced. By the method, the selected scheduled user can be ensured to produce the least interference on the other cells.
Description
Technical field
The invention belongs to the wireless information transfer field, particularly adopt the system of the standard such as WLAN (wireless local area network), broadband wireless access, mobile communication, ground digital television broadcast of multi-antenna technology.
Background technology
Along with the fusion gradually of wireless network, multimedia technology and Internet, people are more and more higher to the requirement of the type of radio communication service and quality.For satisfying the requirement of radio multimedium and high speed data transfers, need the Development of New Generation wireless communication system, as 3G, LTE-Advanced etc.
Present 3G and LTE-Advanced system have adopted respectively CDMA and OFDM technology, can realize identical networking.They make, and in the residential quarter, user's information is carried on mutually orthogonal spreading code or orthogonal sub-carriers, can greatly reduce the interference of the multiple access between the user in the residential quarter.But for Cell Edge User, useful signal intensity is little, and is large from the interference signal intensity of neighbor cell, this letter drying that has reduced Cell Edge User is than (SINR), cause its throughput to descend, make edge customer can not obtain satisfied service, seriously restricted systematic function.Therefore, presence of intercell interference suppresses to become the mobile radio networks problem demanding prompt solution.
At present, propose more wireless network dl interference inhibition technology, but the presence of intercell interference reduction method for up link has seldom been arranged, and be generally limited to the processing of single residential quarter.Based on this, the present invention proposes a kind of user's dispatch deal technology of multi-cell base station associating, and it has advantages of that complexity is low and is easy to Project Realization.
Summary of the invention
The object of the present invention is to provide a kind of low complex degree uplink cells method for reducing interference between that is easy to Project Realization.
Thought of the present invention is: when the user terminal that is in cell edge was communicated by letter with its serving BS, this user terminal can cause interference to the adjacent base station (disturbed base station) of serving BS; If at a certain time slot, select adjacent base station is disturbed less user's transmitted signal, can reduce the interference between the residential quarter.
For convenience of description, define every community user terminal j ∈ { 1, L, N}, serving BS i ∈ { 1, L, K}, disturbed base station k ∈ { 1, L, i-1, i+1, L, K}, wherein N is the maximum user terminal number in every residential quarter, K is maximum service base station number, and the residential quarter at serving BS i place is defined as, cell i,,, the channel condition information between the user j of cell i and this cell i serving BS i is
Channel condition information between the disturbed base station k of user j-neighbor cell of cell i is
Particularly, the implementation step of method proposed by the invention is as follows, as shown in Figure 1.
The first step: user terminal j is to serving BS i and the adjacent disturbed base station k pilot symbol transmitted thereof of affiliated subdistrict i; 101
Second step: disturbed base station k calculates channel condition information between user terminal j and disturbed base station k according to pilot signal
And the mould value square
Be designated as the channel gain size, with its tolerance of adjacent base station being disturbed as this user; 102
The 3rd step: disturbed base station k is the interference metric between user j and disturbed base station k
Be sent to serving BS i end by wireless or wire link; 103
The 4th step: serving BS i calculate each user terminal j to the value of disturbed base station k interference metric and
104
The 5th step: serving BS i selects minimum total corresponding user of interference metric as dispatched users, and distributes time slot to the dispatched users initiating communication.105
The present invention can guarantee that by simple co-operation between serving BS and disturbed base station the dispatched users of selecting is minimum to the interference that cause other residential quarters when communication.
Description of drawings
The scheduling implementation step of a kind of uplink multi-cell base station cooperative user scheduling method of Fig. 1;
Fig. 2 two area interference examples;
Fig. 3 three area interference examples.
Execution mode
Be described further for the present invention below in conjunction with the drawings and specific embodiments.
Embodiment 1:
The explanation as an example of simple two cell-radio networks example, in described two cell communication systems, a base station is contained in every residential quarter, as shown in Figure 2.The interior user side UE1 in residential quarter 1 communicates by letter with the base station node B1 that belongs to residential quarter 1, and the interior user side UE2 in residential quarter 1 also communicates by letter with the base station node B1 that belongs to residential quarter 1.Simultaneously, the UE1 x1 that transmits can cause interference to the base station node B2 of residential quarter 2, and the UE2 x2 that transmits can cause interference to the base station node B2 of residential quarter 2.To time division multiplex system, at a certain time slot T, base station node B1 need to determine scheduling UE1 or UE2 transmitted signal and base station communication.
At first, each user terminal UE1 and UE2 are to serving BS Node B1 and the adjacent disturbed base station node B2 pilot symbol transmitted thereof of affiliated subdistrict.
Then, disturbed base station node B2 calculates respectively channel condition information between user and disturbed base station, the channel condition information between UE1 as interior in residential quarter 1 and Node B2 according to pilot signal
Channel condition information between the interior UE2 in residential quarter 1 and Node B2
Suppose its mould value square
It represents respectively the interference metric that UE1 and UE2 cause adjacent base station Node B2, i.e. the channel gain size.
Then, disturbed base station end Node B2 user UE1 and UE2 to its interference value
Be sent to serving BS Node B1 end.
At serving BS Node B1 end, calculate respectively user UE1 and UE2 adjacent base station is disturbed sum, adjacent base station is only base station node B2 here, is respectively 1.2 and 1.06.
At last, base station node B1 selects minimum total corresponding user UE2 of disturbed one .06 as dispatched users, and distributes this time slot to dispatched users UE2 initiating communication.
Embodiment 2
The below illustrates as an example of typical three area interference wireless networks example, and in described three cell communication systems, a base station is contained in every residential quarter.The interior user side UE1 in residential quarter 1 communicates by letter with the base station node B1 that belongs to residential quarter 1, and the interior user side UE2 in residential quarter 1 also communicates by letter with the base station node B 1 that belongs to residential quarter 1.Simultaneously, the UE1 x1 that transmits can cause interference to residential quarter 2,3 base station node B2, Node B3, and the UE2 x2 that transmits can cause interference to residential quarter 2,3 base station node B2, Node B3.To time division multiplex system, at a certain time slot T, base station node B1 need to determine to dispatch UE1 or the UE2 transmitted signal is communicated by letter with base station node B1.
At first, each user terminal UE1 and UE2 are to the serving BS Node B1 of affiliated subdistrict and adjacent disturbed base station node B2 thereof, Node B3 pilot symbol transmitted.
Then, disturbed base station node B2, Node B3 calculate respectively channel condition information between user and disturbed base station according to pilot signal, and the channel condition information between UE1 as interior in residential quarter 1 and Node B2, Node B3 is respectively
Channel condition information between the interior UE2 in residential quarter 1 and Node B2, Node B3
Suppose that its mould value square is respectively
It represents respectively the interference metric that UE1 and UE2 cause adjacent base station Node B2, Node B3, i.e. the channel gain size.
Then, disturbed base station end Node B2 user UE1 and UE2 to its interference value
Be sent to serving BS Node B1 end; Disturbed base station end Node B3 user UE1 and UE2 to its interference value
Be sent to serving BS Node B1 end.
At serving BS Node B1 end, calculate respectively user UE1 and UE2 adjacent base station is disturbed sum, wherein, UE1 to the interference of Node B2, Node B3 is
UE2 to the interference of Node B2, Node B3 is
At last, base station node B1 selects minimum total 2.18 corresponding user UE2 of interference as dispatched users, and distributes this time slot to dispatched users UE2 initiating communication.
Can see, in up link, the user scheduling method that adopts the present invention to propose can reduce the user to the interference of neighbor cell, and institute's extracting method is easy to Project Realization.
Claims (1)
1. uplink multi-cell base station cooperative user scheduling method, when the user terminal that is in cell edge was communicated by letter with its serving BS, this user terminal can be that interference is caused in disturbed base station to the adjacent base station of serving BS; At a certain time slot, select adjacent base station is disturbed less user's transmitted signal, reduced the interference between the residential quarter; It is characterized in that:
Define every community user terminal j ∈ 1 ..., N} serving BS i ∈ { 1, the disturbed base station of K} k ∈ 1 ..., i-1, i+1,, K} wherein N is every residential quarter maximum number of user, K is maximum service base station number, serving BS i residential quarter is defined as cell i, and the channel condition information between the user j of cell i and this cell i serving BS i is
Channel condition information between the user j of cell i, the disturbed base station k of neighbor cell is
The implementation step of described method is as follows:
The first step: user terminal j is to serving BS i and the adjacent disturbed base station k pilot signal transmitted thereof of affiliated subdistrict i;
Second step: disturbed base station k calculates channel condition information between user terminal j and disturbed base station k according to pilot signal
And the mould value square
Be designated as the channel gain size, with its tolerance of adjacent base station being disturbed as this user;
The 3rd step: disturbed base station k is the interference metric between user j and disturbed base station k
Be sent to serving BS i end by wireless or wire link;
The 4th step: serving BS i calculate each user terminal j to the value of disturbed base station k interference metric and
The 5th step: serving BS i select to calculate in described the 4th step gained interference metric value and the corresponding user of minimum value as dispatched users, and distribute time slot to the dispatched users initiating communication.
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| CN102170704B true CN102170704B (en) | 2013-11-06 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079663A (en) * | 2006-05-24 | 2007-11-28 | 方正通信技术有限公司 | Method, base station and system for reducing interference of adjacent cells of wireless cellular system |
| CN101478342A (en) * | 2009-01-22 | 2009-07-08 | 清华大学 | Method for cooperative scheduling between multiple districts in multi-antenna cellular communication system |
| CN101854725A (en) * | 2010-06-30 | 2010-10-06 | 西安交通大学 | Resource distribution and power distribution method for cellular multi-cell orthogonal frequency division multiple access (OFDMA) system |
| CN101877918A (en) * | 2009-04-30 | 2010-11-03 | 清华大学 | Equipment and method for dynamic clustering of base station in mobile communication |
| CN101986574A (en) * | 2010-10-02 | 2011-03-16 | 上海交通大学 | Method for optimizing beam forming matrix for multi-base station collaboration system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101079663A (en) * | 2006-05-24 | 2007-11-28 | 方正通信技术有限公司 | Method, base station and system for reducing interference of adjacent cells of wireless cellular system |
| CN101478342A (en) * | 2009-01-22 | 2009-07-08 | 清华大学 | Method for cooperative scheduling between multiple districts in multi-antenna cellular communication system |
| CN101877918A (en) * | 2009-04-30 | 2010-11-03 | 清华大学 | Equipment and method for dynamic clustering of base station in mobile communication |
| CN101854725A (en) * | 2010-06-30 | 2010-10-06 | 西安交通大学 | Resource distribution and power distribution method for cellular multi-cell orthogonal frequency division multiple access (OFDMA) system |
| CN101986574A (en) * | 2010-10-02 | 2011-03-16 | 上海交通大学 | Method for optimizing beam forming matrix for multi-base station collaboration system |
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