Background technology
Basic duplex mode for the cellular system employing: TDD (time division duplex) pattern refers to that uplink downlink uses same working band, carry out the transmission of uplink and downlink signals in the different time intervals, protection (Guard Period) is at interval arranged between the up-downgoing; FDD (Frequency Division Duplexing (FDD)) pattern refers to that then uplink downlink uses different working bands, can be engraved in the transmission that different frequency carriers carries out uplink and downlink signals when same, and protection bandwidth (Guard Band) is arranged between the up-downgoing.The frame structure of LTE (Long Term Evolution) TDD system is more complex slightly, and as shown in Figure 1, a radio frames length is 10ms, comprises special subframe and conventional subframe two classes totally 10 subframes, and each subframe is 1ms.Special subframe is divided into 3 time slot: DwPTS (descending pilot frequency time slot, Downlink Pilot Time Slot), GP (protection interval, Guard Period) and UpPTS (uplink pilot time slot, Uplink Pilot Time Slot).Conventional subframe comprises sub-frame of uplink and descending sub frame, is used for transmission upstream control signaling, descending control signaling and business datum etc.Wherein in a radio frames, can dispose two special subframes (being positioned at subframe #1 and #6), also can dispose a special subframe (being positioned at subframe #1).DwPTS time slot in subframe #0 and subframe #5 and the special subframe is always as downlink transfer, and the UpPTS time slot in subframe #2 and the special subframe always is used for uplink, and other subframe can be configured to as uplink or downlink transfer according to needs.
Ascending-descending subframes distributes 7 kinds of different modes of support among the TD-LTE, and the concrete configuration parameter is as shown in table 1 below, and D represents that as downlink transfer U represents that S represents that this subframe is special subframe, comprises DwPTS, GP and UpPTS three parts as uplink.
Table 1, LTE TDD ascending-descending subframes configuration format
The configuration of above-mentioned special subframe and the ascending-descending subframes method of salary distribution are passed through system information, and (System Information SI) is broadcast to all users in the residential quarter.
The present inventor finds, in real system, if different residential quarters is provided with different ascending-descending subframes configurations, then can cause the cross time-slot of neighbor cell to disturb, as shown in Figure 2.It is pointed out that the neighbor cell here can be geographical residential quarter (as shown in Figure 2) of the adjacent same TDD carrier wave of use.Simultaneously, residential quarter described here can be the residential quarter of disposing with layer (for example macrocell), also can be the residential quarter (for example comprising the residential quarter of macrocell, Microcell, Home eNodeB covering etc.) that layering is disposed.This type of cross time-slot disturb for systematic function to influence heel administration's scene and wireless environment etc. closely related, if close together between the neighbor cell for example, perhaps the signal propagation conditions is better, then the serious estate performance that is in accepting state that reduces of cross time-slot interference meeting; If distance is far away between the neighbor cell, perhaps exist effective signal to block etc., then the cross time-slot interference level is for the estate performance influence that is in accepting state and little.
In the existing solution that proposes, can not effectively solve cross time-slot and disturb the having a strong impact on of systematic function, particularly the up-downgoing cross time-slot between UE shown in Figure 2 and the UE disturbs.
Embodiment
There is the different transmission of while travel direction between UE and the neighbor cell UE base station in the embodiment of the invention in determining local area, and this local area UE is when being positioned at cell edge near described neighbor cell, determine that this local area UE may be interfered, and this interference mainly is because the different transmission of while travel direction between UE and the neighbor cell UE in the local area, therefore the base station to the up-downgoing transmitting and scheduling of the described local area UE of major general to carrying out the transmission of equidirectional simultaneously with neighbor cell UE, to reduce interference.
The adjacent TDD residential quarter of hypothesis in the consolidated network is time synchronized in the present embodiment, and the neighbor cell of mentioning here can be with neighbor cell frequently, also can be adjacent neighbor cell frequently; Simultaneously can be the neighbor cell (for example all being Macro (grand) residential quarter) with layer, also can be the neighbor cell (for example Macro residential quarter and femto (femto) residential quarter, perhaps Macro residential quarter and Pico (little) residential quarter) that layering is disposed.
Referring to Fig. 3, the main method flow process of transmitting and scheduling is as follows in the present embodiment:
Step 301: the base station obtains the uplink-downlink configuration information of neighbor cell.Concrete, the base station can obtain the uplink-downlink configuration information of neighbor cell by modes such as network interface Signalling exchanges.
Whether simultaneously step 302: the base station is according to the uplink-downlink configuration information of local area and the uplink-downlink configuration information of neighbor cell, judge between local area UE and the neighbor cell UE the different transmission of travel direction.The base station judges whether local area and neighbor cell adopt identical configuration to get final product, and the configuration sequence number is different just to exist the situation of carrying out the different directions transmission simultaneously.
Step 303: when between local area UE and the neighbor cell UE during the different transmission of travel direction simultaneously, the base station judges whether described local area UE is positioned at the cell edge near described neighbor cell.When travel direction is identical simultaneously between local area UE and the neighbor cell UE transmission, process ends.
Step 304: when described local area UE is positioned at cell edge near described neighbor cell, the base station to the up-downgoing transmitting and scheduling of the described local area UE of major general to carrying out simultaneously on the subframe of equidirectional transmission with neighbor cell UE.When described local area UE is not interfered, can continue according to current configuration UE to be dispatched.
Multiple specific implementation is arranged in step 303, as the base station judge UE whether be in local area and as described in the edge of neighbor cell, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, the measurement result that reports by described local area UE of base station judges whether described local area UE is positioned at the cell edge near described neighbor cell.Can determine that the technology whether described local area UE is positioned near the cell edge of described neighbor cell all is applicable to present embodiment.Wherein, the base station obtains the positional information of base station of described neighbor cell and the positional information of described local area UE by locate mode, and judges according to the positional information of the base station that obtains and the positional information of described local area UE whether UE is in the edge of local area and described neighbor cell.Perhaps, the base station is by Operation and Maintenance entity (Operation and Maintenance, OAM) obtain described neighbor cell the base station positional information and obtain the positional information of described local area UE by locate mode, and judge according to the positional information of the base station that obtains and the positional information of described local area UE whether UE is in the edge of local area and described neighbor cell.Concrete locate mode has: AOA+TA (Angle of Arrival+Timing advance, the angle of arrival and timing advance) or OTDOA (Observed Time Difference Of Arrival, the time of advent is poor) etc.
The base station judges whether UE is subjected to interference that multiple specific implementation is also arranged, the signal quality value preset first threshold (for example 0dB) of local area as described in whether the signal quality value of neighbor cell exceeded as described in local area UE reported as described in judging as the base station, if, then the signal of neighbor cell is stronger, determines that described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, the base station judges that whether the absolute value of the difference between the signal quality value of the signal quality value of the described neighbor cell that described local area UE reports and described local area is less than preset second threshold value (for example 3dB), if, then the signal strength signal intensity of local area and neighbor cell is suitable, determine that UE is in cell edge, think that described local area UE may be interfered.Perhaps, the base station judge described local area UE to the path loss values of described neighbor cell low default the 3rd threshold value (for example 0dB) of path loss values of described local area, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, the base station judge described local area UE to the absolute value of the difference between the path loss values of the path loss values of described neighbor cell and described local area whether less than the 4th threshold value of presetting (for example 3dB), if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Wherein, signal quality comprises RSRP (Reference Signal Received Power, Reference Signal Received Power) or RSRQ (Reference Signal Received Quality, Reference Signal Received Quality) etc.The path loss of described local area can obtain by local area reference signal transmitting power being deducted the local area signal quality (as RSRP) that UE reports, and described local area UE can deduct the neighboring cell signal quality that UE reports by adjacent area reference signal transmitting power to the path loss of described neighbor cell and obtain.The reference signal transmitting power of adjacent area can be notified to local area by the network interface between the residential quarter.
There is multiple scheduling mode the base station in the step 304, as the base station with as described in the base station of neighbor cell adopt identical uplink-downlink configuration.Concrete, the base station negotiate of base station and described neighbor cell is determined identical uplink-downlink configuration.For example, a kind of configuration is determined in the base station, and the sequence number that will dispose sends to the base station of described neighbor cell, acknowledge message is returned in the base station of described neighbor cell then, perhaps a kind of configuration is determined in the base station of described neighbor cell, and the sequence number that will dispose sends to the local area base station, and acknowledge message is returned in the local area base station.Perhaps, the uplink-downlink configuration of acquiescence is all adopted in the base station of base station and described neighbor cell.Wherein, the local area base station disposes identical acquiescence uplink-downlink configuration with the base station of described neighbor cell.
Perhaps, on the subframe of constant transmissions, the subframe of constant transmissions comprises fixedly sub-frame of uplink and fixedly descending sub frame with the up-downgoing transmitting and scheduling of described local area UE in the base station.For example downlink transmitting and dispatching is fixed as in each radio frames on the descending subframe 0,1,5,6, and the uplink scheduling is fixed as in each radio frames on the subframe 2,7 of uplink.As shown in Figure 4, the Macro base station find MUE (UE in the macrocell) may and HeNB UE (UE under the Home eNodeB) between produce cross time-slot and disturb, then with in the descending sub frame 0,1,4,5,6,9 of its descending scheduling in radio frames, uplink scheduling is in sub-frame of uplink 2,7.
Owing to have above numerous embodiments, introduce in detail below by two exemplary embodiments.
Referring to Fig. 5, local area adopts the transmission dispatching method flow process of identical configuration as follows with the adjacent area in the present embodiment:
Step 501: the base station can obtain the uplink-downlink configuration information of neighbor cell by the network interface Signalling exchange.Any mode that obtains the uplink-downlink configuration information of neighbor cell all is applicable to present embodiment.
Whether simultaneously step 502: the base station is according to the uplink-downlink configuration information of local area and the uplink-downlink configuration information of neighbor cell, judge between local area UE and the neighbor cell UE the different transmission of travel direction, if, continue step 503, otherwise process ends.
Step 503: the base station judges whether UE is in the edge of local area and described neighbor cell, if, determine that then described local area UE is positioned at the cell edge near described neighbor cell, continue step 504, otherwise process ends.
Step 504: the base station negotiate of base station and described neighbor cell, determine identical uplink-downlink configuration.
Referring to Fig. 6, the base station is when the up-downgoing transmitting and scheduling of described local area UE is on the subframe of constant transmissions in the present embodiment, and the transmission dispatching method flow process is as follows:
Step 601: the base station can obtain the uplink-downlink configuration information of neighbor cell by the network interface Signalling exchange.
Whether simultaneously step 602: the base station is according to the uplink-downlink configuration information of local area and the uplink-downlink configuration information of neighbor cell, judge between local area UE and the neighbor cell UE the different transmission of travel direction, if, continue step 603, otherwise process ends.
Step 603: the measurement result that the base station reports by described local area UE judges whether described local area UE is positioned at the cell edge near described neighbor cell, if, then continue step 604, otherwise process ends.
Step 604: the base station with the up-downgoing transmitting and scheduling of described local area UE on the subframe of constant transmissions.
Understood the implementation procedure of scheduled transmission by above description, this process mainly realizes that by the base station internal structure and the function to the base station is introduced below.
Referring to Fig. 7, the base station comprises in the present embodiment: acquisition module 701, transmission judge module 702, interference judge module 703 and scheduler module 704.This base station comprises macro base station, little base station, Home eNodeB etc.
Acquisition module 701 is used for obtaining the uplink-downlink configuration information of neighbor cell.Concrete, acquisition module 701 obtains the uplink-downlink configuration information of neighbor cell by the network interface Signalling exchange.
Transmission judge module 702 is used for according to the uplink-downlink configuration information of local area and the uplink-downlink configuration information of neighbor cell, judges between local area UE and the neighbor cell UE the whether different transmission of while travel direction.
Disturb judge module 703 to be used for when the different transmission of while travel direction between local area UE and the neighbor cell UE, the base station judges whether described local area UE is positioned at the cell edge of close described neighbor cell.Concrete, disturb judge module 703 to judge whether UE is in the edge of local area and described neighbor cell, if determine that then described local area UE is positioned at the cell edge near described neighbor cell; Perhaps, the measurement result that reports by described local area UE judges whether described local area UE is positioned at the cell edge near described neighbor cell.
Scheduler module 704 is used for when described local area UE is positioned at cell edge near described neighbor cell, to the up-downgoing transmitting and scheduling of the described local area UE of major general to carrying out simultaneously on the subframe of equidirectional transmission with neighbor cell UE.Concrete, scheduler module 704 adopts identical uplink-downlink configuration with the base station of described neighbor cell; Perhaps, with the up-downgoing transmitting and scheduling of described local area UE on the subframe of constant transmissions.Wherein, the base station negotiate of scheduler module 704 and described neighbor cell is determined identical uplink-downlink configuration; Perhaps, all adopt the uplink-downlink configuration of acquiescence with the base station of described neighbor cell.
Preferable, disturb judge module 703 to obtain the positional information of base station of described neighbor cell and the positional information of described local area UE by locate mode, and judge according to the positional information of the base station that obtains and the positional information of described local area UE whether UE is in the edge of local area and described neighbor cell.Perhaps, disturb judge module 703 obtain by Operation and Maintenance entity OAM described neighbor cell the base station positional information and obtain the positional information of described local area UE by locate mode, and judge according to the positional information of the base station that obtains and the positional information of described local area UE whether UE is in the edge of local area and described neighbor cell.For example, disturb judge module 703 to judge whether the signal quality value of the described neighbor cell that described local area UE reports exceeds the signal quality value preset first threshold of described local area, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, disturb judge module 703 to judge that whether the absolute value of the difference between the signal quality value of the signal quality value of the described neighbor cell that described local area UE reports and described local area is less than the preset second threshold value, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, disturb judge module 703 judge described local area UE to the path loss values of described neighbor cell low the 3rd default threshold value of path loss values of described local area, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.Perhaps, disturb judge module 703 judge described local area UE to the absolute value of the difference between the path loss values of the path loss values of described neighbor cell and described local area whether less than the 4th threshold value of presetting, if determine that then described local area UE is positioned at the cell edge near described neighbor cell.
There is the different transmission of while travel direction between UE and the neighbor cell UE base station in the embodiment of the invention in determining local area, and this local area UE is when being positioned at cell edge near described neighbor cell, determine that this local area UE may be interfered, and this interference mainly is because the different transmission of while travel direction between UE and the neighbor cell UE in the local area, therefore the base station to the up-downgoing transmitting and scheduling of the described local area UE of major general to carrying out the transmission of equidirectional simultaneously with neighbor cell UE, to reduce interference.The embodiment of the invention provides multiple implementation for each link substantially, realizes being applicable to plurality of application scenes and multiple systems flexibly.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.