CN101800569A - Method for transmitting reference marks and base station - Google Patents
Method for transmitting reference marks and base station Download PDFInfo
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- CN101800569A CN101800569A CN200910006902A CN200910006902A CN101800569A CN 101800569 A CN101800569 A CN 101800569A CN 200910006902 A CN200910006902 A CN 200910006902A CN 200910006902 A CN200910006902 A CN 200910006902A CN 101800569 A CN101800569 A CN 101800569A
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Abstract
The invention discloses a method for transmitting reference marks and a base station. The method comprises that: in a downlink control domain, the base station allocates reference mark time-frequency resources for relay stations which are in the same cell respectively and informs all the relay stations; and each relay station transmits the reference marks on the reference mark time-frequency resource allocated to each. The base station comprises a reference mark time-frequency resource allocation module and a resource informing module. Due to the adoption of the method and the base station, the influence on the backward compatibility of a terminal can be reduced; by allocating different reference mark time-frequency resources for the base station and each relay station, the conflict between the reference mark of the base station and the reference mark of each relay station can be prevented when the base station and the relay stations work in the downlink at the same time.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to the sending method and the base station of reference symbol in a kind of mobile communication system that comprises relay station.
Background technology
The demand for development of next generation mobile communication system in the mobile communication (B3G/4G) is to support that more high transfer rate, more perfect signal cover and higher resource utilization.In order to reach high transfer rate, next generation mobile communication system will adopt more high frequency band transmission signals, and higher frequency bandwidth will be brought bigger path loss simultaneously, influence the network coverage.Relaying (Relay) technology can increase covering and balance, increase cell throughout, and relay station (Relay Station is called for short RS) is than the base station (BaseStation is called for short BS), have less relatively deployment cost, so relaying is regarded as a key technology in the next generation mobile communication system.
As shown in Figure 1, in comprising the mobile communication system of relay station, user terminal (UserEquipment, be called for short UE) there are two kinds with the communication mode of base station: a kind of is the mode of utilizing in the conventional communication networks that directly communicates with the base station, and a kind of is that relay services by relay station realizes and the mode of base station communication.In the trunking traffic mode, the expense of running time-frequency resource has tangible increase than first kind of direct communication mode.At OFDM (Orthogonal Frequency Division Multiplexing, OFDM) in the communication system, especially introduce after the relay station, effective management of running time-frequency resource has extremely important influence for the spectrum efficiency that improves system, increase power system capacity.
In comprising the wireless communication system of relay station, signal of base station need arrive and the process relay station.If base station and relay station are worked simultaneously and are had when overlapping covered when base station and each relay station at down link, the reference symbol (Reference Symbol) that relay station sends may produce interference for the terminal of not supporting relaying technique, the base station also may send reference symbol with each relay station on identical running time-frequency resource, cause the reference symbol of base station and each relay station to clash, this brings problems such as Route Selection difficulty, channel measurement are inaccurate, resource utilization reduction will for base station, relay station and terminal.
Summary of the invention
The technical problem to be solved in the present invention provides the sending method and the base station of reference symbol in a kind of communication system that comprises relay station, reduces the influence to the backwards compatibility of terminal.
In order to address the above problem, the invention provides a kind of sending method of reference symbol, a kind of sending method of reference symbol, comprise: for being in each relay station assigned references symbol running time-frequency resource of same sub-district with it and notifying described relay station, each relay station sends reference symbol on for the reference mark time-frequency resource of its distribution in descending control domain in the base station.
Further, the running time-frequency resource of described each relay station reference symbol shared resource element position in descending control domain is different.
Further, when described relay station sends reference symbol at a plurality of antenna ports, the base station is line cap difference assigned references symbol running time-frequency resource every day that sends reference symbol in each relay station, at the antenna port place that sends reference symbol, described relay station sends reference symbol on the reference mark time-frequency resource of distributing for this antenna port, each antenna port corresponding reference symbol running time-frequency resource shared resource element position in descending control domain is different.
Further, described base station is in each relay station and this base station assigns reference mark time-frequency resource of same sub-district for base station therewith in descending control domain, and will notify described relay station for the reference mark time-frequency resource that described relay station distributes, described base station and each relay station send reference symbol respectively on for the reference mark time-frequency resource of its distribution.
Further, during for the base station that is in same sub-district and each relay station assigned references symbol running time-frequency resource, the shared resource element position in descending control domain of the reference mark time-frequency resource between base station and each relay station and the different relay station is different.
Further, when described base station and/or relay station send reference symbol at a plurality of antenna ports, the base station sends the line cap every day assigned references symbol running time-frequency resource respectively of reference symbol in base station and/or each relay station for this reason, described base station and/or each relay station are respectively at the antenna port place that sends reference symbol separately, the reference mark time-frequency resource of utilizing antenna port for this reason to distribute sends reference symbol, and each antenna port corresponding reference symbol running time-frequency resource shared resource element position in descending control domain is different.
Further, described reference mark time-frequency resource does not comprise the running time-frequency resource of transmission public guide frequency in base station in the described descending control domain; In long evolving system and advanced long-term evolution system, reference mark time-frequency resource is that unit distributes with the control channel element in the descending control domain.
Further, described base station and/or relay station are also notified terminal with the distribution condition of described reference mark time-frequency resource.
In order to address the above problem, the invention provides a kind of base station, described base station comprises reference mark time-frequency resource allocation module and resource informing module; Described reference mark time-frequency resource allocation module, be used in descending control domain, under the shared mutually different condition in resource element position, being each relay station assigned references symbol running time-frequency resource in each relay station reference mark time-frequency resource separately that guarantees to be in same sub-district with described base station; And this resource allocation notified to resource informing module; Described resource informing module is used for notifying each relay station and/or terminal with the reference mark time-frequency resource of distributing for each relay station.
Further, described base station also comprises the reference symbol sending module; Described reference mark time-frequency resource allocation module, also be used for guarantee described base station and and its be between each relay station of same sub-district and each relay station separately reference mark time-frequency resource in descending control domain under the shared mutually different condition in resource element position, base station and each relay station assigned references symbol running time-frequency resource for this reason; And the resource information of base station assigns is sent to described reference symbol sending module for this reason; Described reference symbol sending module also is used for sending reference symbol on described reference mark time-frequency resource allocation module is the reference mark time-frequency resource of base station assigns.
Adopt method of the present invention and base station, can reduce influence to the backwards compatibility of terminal, and, can prevent that base station and relay station are when down link is worked simultaneously between base station and the relay station and the conflict of the reference symbol between the different relay station by being the base station reference mark time-frequency resource different with the distribution of each relay station.
Description of drawings
Fig. 1 is in comprising the mobile communication system of relay station, the schematic diagram of user terminal and base station and relay station connected mode;
Fig. 2 is the flow chart of reference symbol sending method among the present invention;
Fig. 3 has a descending sub frame of general cyclic prefix length and the structural representation of a Physical Resource Block in this subframe in Long Term Evolution (Long Term Evolution the is called for short LTE) system;
Fig. 4 is the mapping pattern schematic diagram of reference symbol in the described Physical Resource Block of Fig. 3 of base station and each relay station in the specific embodiment.
Embodiment
Among the present invention, the base station is base station and each relay station assigned references symbol running time-frequency resource for be in same sub-district with it in descending control domain, avoided the interference of reference symbol that relay station sends, reduced influence the backwards compatibility of terminal to the Data Receiving of the terminal of not supporting relaying technique.
When the signal that the public guide frequency that sends at descending control domain in the assurance base station is not sent by relay station disturbs, the influence to the backwards compatibility of terminal can also can be reduced only for be in each relay station assigned references symbol running time-frequency resource of same sub-district with it in descending control domain in the base station.
The base station only is when being in each relay station assigned references symbol running time-frequency resource of same sub-district with it, in order to prevent the conflict of each relay station reference symbol of each relay station when down link is worked simultaneously, each relay station reference mark time-frequency resource separately shared resource element position in descending control domain is different.The base station is during for the base station that is in same sub-district with it and each relay station assigned references symbol running time-frequency resource, in order to prevent the conflict of reference symbol between base station and relay station and the different relay station when down link is worked simultaneously of base station and each relay station, the shared resource element position in descending control domain of the reference mark time-frequency resource between base station and each relay station and the different relay station is different.
Base station in the present embodiment comprises reference mark time-frequency resource allocation module and resource informing module;
Reference mark time-frequency resource allocation module, be used in descending control domain, under the shared mutually different condition in resource element position, being each relay station assigned references symbol running time-frequency resource in each relay station reference mark time-frequency resource separately that guarantees to be in same sub-district with described base station; And this resource allocation notified to resource informing module;
Resource informing module is used for notifying each relay station and/or terminal with the reference mark time-frequency resource of distributing for each relay station.
Reference mark time-frequency resource allocation module, also be used for guarantee described base station and and its be between each relay station of same sub-district and each relay station separately reference mark time-frequency resource in descending control domain under the shared mutually different condition in resource element position, base station and each relay station assigned references symbol running time-frequency resource for this reason; And the resource information of base station assigns is sent to described reference symbol sending module for this reason;
The reference symbol sending module also is used for sending reference symbol on described reference mark time-frequency resource allocation module is the reference mark time-frequency resource of base station assigns.
Reference mark time-frequency resource between base station and relay station and each relay station shared resource element position in descending control domain is different.
As shown in Figure 2, the sending method of reference symbol may further comprise the steps:
Descending control domain is at LTE and LTE-A (LTE-Advanced, senior LTE) is meant preceding n OFDM symbol in each subframe in the system, n is the integer greater than zero, in the LTE system, n is greater than zero and smaller or equal to 4 integer, is meant the physical resource of information such as the scheduling that is used for sending terminal and configuration in other systems.Wherein, physical resource is meant the two-dimentional resource of time-domain and frequency domain in ofdm system.
Above-mentioned resource allocation can be finished by the base station, also can be finished by other network elements of being responsible for this function in the system.Can be in each frame all the reserve part running time-frequency resource be used to carry reference symbol, also can be only in partial frame the reserve part running time-frequency resource be used for reference symbol.Above-mentioned reference mark time-frequency resource can be to distribute in real time, also can be semi-static or static allocation.
A part of resource is determined in the base station in descending control domain, be base station in the same sub-district and each relay station assigned references symbol running time-frequency resource respectively in this part resource, base station and each relay station reference mark time-frequency resource separately shared resource element position in this part resource is different.As Fig. 3 is to have general cyclic prefix in the LTE system (thick frame rectangular area wherein is the Physical Resource Block (resource block is called for short RB) in this subframe for Cyclic Prefix, the CP) structural representation of length subframe.This RB takies 7 OFDM symbols in time domain, takies 12 subcarriers at frequency domain, resource element of each little square expression (resource element is called for short RE) among the figure.Suppose that the physical down control domain has taken preceding 3 the OFDM symbols in this subframe.The base station is removed in descending control domain resource and is each relay station assigned references symbol running time-frequency resource in base station and the same sub-district thereof in the running time-frequency resource that sends public guide frequency.
When base station and each relay station all use single antenna to send reference symbol, when the relay station number in the sub-district, place, base station is N, the base station is removed in descending control domain and is determined the running time-frequency resource that sends public guide frequency that N+1 group resource element is used for the base station and N relay station sends reference symbol, base station and each relay station respectively use one group, the resource location of each group is different, and the resource element number that each group takies is more than or equal to 1.
In multiple-input and multiple-output (MIMO) channel, the reference symbol in the descending control domain can be only in the base station and/or an antenna port of each relay station send, also can be in the base station and/or a plurality of antenna ports of each relay station send.Base station or relay station send reference symbol at a plurality of antenna ports, and when the antenna port number that sends reference symbol in base station and each relay station is M altogether, the base station is removed in the descending control domain resource and is determined in the running time-frequency resource that sends public guide frequency that the M group is used for M antenna port transmission reference symbol, the antenna port that sends reference symbol respectively uses one group, the resource location of each group is inequality, and the resource element number that each group takies is more than or equal to 1.
The physical resource that sends reference symbol in the descending control domain can distribute for unit with control channel element (Control Channel Element is called for short CCE) in the LTE/LTE-A system.Down control channel in LTE, the RE that is used to send control information are that unit divides into groups with CCE, and each CCE has 9 resource groups (resource-element group is called for short REG), and each REG has 4 RE.In LTE, terminal is after receiving down control channel information, with CCE is that unit carries out the control information detection, the least unit that is terminal detection control information is a CCE, therefore be unit assigned references symbol running time-frequency resource with CCE in the present embodiment, such as, use the mapping resource of 6 CCE at current descending control domain as the reference symbol, just can obtain 36*6 RE so altogether and be used for the mapping reference symbol.If the base station is not unit assigned references symbol running time-frequency resource with CCE, can be dispersed in reference symbol in the descending control domain, having increased is the detection difficulty that unit detects the terminal of not supporting relay station of control information with CCE, the probability that makes terminal detect the signal that can not discern increases, when the base station with CCE is unit assigned references symbol running time-frequency resource, do not support the terminal of relay station technology, whether the CCE that can be easy to judge its detection is its information that can discern, is reduced in the Error detection rate when detecting control information.
In LTE and LTE-A system, REG is made up of the RE of continuous distribution on the frequency domain direction, and each REG must be positioned at same OFDM symbol on time domain.Distribution for a plurality of REG that belong to same CCE can upset by certain rule, needn't be in the frequency domain continuous distribution.The base station is preferably identical with resource element order along frequency domain direction in each REG that each relay station takies, and base station signaling consumption when relay station is notified this resource is less like this.
When base station or relay station all shone upon reference symbol on an antenna port, after the resource location of this base station and the use of each relay station was determined in the base station, base station and each relay station sent reference symbol separately on the resource location that distributes; Each relay station does not send any signal on the resource location of base station correspondence; A certain relay station sends reference symbol on its resource location in allocation result, base station and other relay station continue hereinto and do not send any signal on the corresponding resource location in station, do not disturb mutually to guarantee the reference symbol that base station and each relay station send.
In multi-input multi-ouput channel, the base station or the relay station that send reference symbol on many antenna ports send reference symbol by each antenna port at the resource location place of this antenna port correspondence, and the antenna port of base station or relay station does not send any signal on the resource location that does not belong to this antenna port.For example, certain relay station is on the first antenna port corresponding reference symbol running time-frequency resource at its first antenna port and sends reference symbol, other antenna port of this relay station and base station and other relay station do not send any signal on the reference mark time-frequency resource of this first antenna port, do not disturb mutually to guarantee the reference symbol that each antenna port sends.Therefore the present invention is equally applicable to many antennas situation of base station and relay station.
Below in conjunction with accompanying drawing and example the method among the present invention is described in more details.
Embodiment one:
As shown in Figure 4, in the LTE-A system, the base station comprises four relay stations in same sub-district, be designated as RS1, RS2, RS3, RS4 respectively.System is the mapping resource of unit reservation of resource as base station and relay station reference symbol with CCE.Three thick frame rectangular areas among the figure are three the resource groups (REG) that belong to same CCE in the current physical piece, are designated as REG1, REG2 and REG3 respectively, and this CCE is among each CCE in the reservation of resource.
In this example, the base station does not send reference symbol of the present invention, and each relay station all only sends reference symbol at an antenna port.Among the figure, the resource element position of representing four the antenna terminal mapping common pilot signals in base station with the resource element of black round dot filling, one group of resource element that right oblique line is filled represents that RS1 sends the position of reference symbol, one group of resource element that left side oblique line is filled represents that RS2 sends the position of reference symbol, one group of resource element that horizontal line is filled represents that RS3 sends the position of reference symbol, and one group of resource element that graticule line is filled represents that RS4 sends the position of reference symbol.The base station is at RS1, RS2, and RS3 and RS4 corresponding reference sign resources position do not send any signal; RS1, RS2 and RS3 do not send any signal in RS4 corresponding reference sign resources position; In like manner, RS1, RS2 and RS4 do not send any signal in RS3 corresponding reference sign resources position; RS1, RS3 and RS4 do not send any signal in RS2 corresponding reference sign resources position; RS2, RS3 and RS4 do not send any signal in RS1 corresponding reference sign resources position.
Embodiment two:
As shown in Figure 4, in the LTE-A system, the base station comprises a relay station and is designated as RS in same sub-district.The base station comprises four antenna ports, sends reference symbol at first and second antenna ports; RS also sends reference symbol respectively at two antenna ports.Among the figure, the resource element position of representing four the antenna terminal mapping common pilot signals in base station with the resource element of black round dot filling, one group of resource element that right oblique line is filled is represented the position of base station in first antenna port transmission reference symbol, and one group of resource element that left oblique line is filled represents that the base station sends the position of reference symbol at second antenna port; One group of resource element that horizontal line is filled is represented the position of RS in its first antenna port transmission reference symbol, and one group of resource element that graticule line is filled represents that RS sends the position of reference symbol at its second antenna port.Base station third and fourth antenna port does not all send any signal at above-mentioned four reference symbol resource locations.
In sum, comprise in the mobile communication system of relay station, adopt method of the present invention and base station, can reduce influence to the backwards compatibility of terminal, and, can prevent that base station and relay station are when down link is worked simultaneously between base station and the relay station and the conflict of the reference symbol between the different relay station by being the base station reference mark time-frequency resource different with the distribution of each relay station.
Certainly; it more than is a kind of concrete implementation method of the present invention; the present invention also not only is confined on the above-mentioned concrete grammar; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (10)
1. the sending method of a reference symbol is characterized in that,
For being in each relay station assigned references symbol running time-frequency resource of same sub-district with it and notifying described relay station, each relay station sends reference symbol on for the reference mark time-frequency resource of its distribution in descending control domain in the base station.
2. the method for claim 1 is characterized in that,
The running time-frequency resource of described each relay station reference symbol shared resource element position in descending control domain is different.
3. method as claimed in claim 2 is characterized in that,
When described relay station sends reference symbol at a plurality of antenna ports, the base station is line cap difference assigned references symbol running time-frequency resource every day that sends reference symbol in each relay station, at the antenna port place that sends reference symbol, described relay station sends reference symbol on the reference mark time-frequency resource of distributing for this antenna port, each antenna port corresponding reference symbol running time-frequency resource shared resource element position in descending control domain is different.
4. the method for claim 1 is characterized in that,
Described base station is in each relay station and this base station assigns reference mark time-frequency resource of same sub-district for base station therewith in descending control domain, and will notify described relay station for the reference mark time-frequency resource that described relay station distributes, described base station and each relay station send reference symbol respectively on for the reference mark time-frequency resource of its distribution.
5. method as claimed in claim 4 is characterized in that,
During for the base station that is in same sub-district and each relay station assigned references symbol running time-frequency resource, the shared resource element position in descending control domain of the reference mark time-frequency resource between base station and each relay station and the different relay station is different.
6. method as claimed in claim 5 is characterized in that,
When described base station and/or relay station send reference symbol at a plurality of antenna ports, the base station sends the line cap every day assigned references symbol running time-frequency resource respectively of reference symbol in base station and/or each relay station for this reason, described base station and/or each relay station are respectively at the antenna port place that sends reference symbol separately, the reference mark time-frequency resource of utilizing antenna port for this reason to distribute sends reference symbol, and each antenna port corresponding reference symbol running time-frequency resource shared resource element position in descending control domain is different.
7. as claim 1 or 4 described methods, it is characterized in that,
Described reference mark time-frequency resource does not comprise the running time-frequency resource of transmission public guide frequency in base station in the described descending control domain; In long evolving system and advanced long-term evolution system, reference mark time-frequency resource is that unit distributes with the control channel element in the descending control domain.
8. as claim 1 or 4 described methods, it is characterized in that,
Described base station and/or relay station are also notified terminal with the distribution condition of described reference mark time-frequency resource.
9. a base station is characterized in that,
Described base station comprises reference mark time-frequency resource allocation module and resource informing module;
Described reference mark time-frequency resource allocation module, be used in descending control domain, under the shared mutually different condition in resource element position, being each relay station assigned references symbol running time-frequency resource in each relay station reference mark time-frequency resource separately that guarantees to be in same sub-district with described base station; And this resource allocation notified to resource informing module;
Described resource informing module is used for notifying each relay station and/or terminal with the reference mark time-frequency resource of distributing for each relay station.
10. base station as claimed in claim 9 is characterized in that described base station also comprises the reference symbol sending module;
Described reference mark time-frequency resource allocation module, also be used for guarantee described base station and and its be between each relay station of same sub-district and each relay station separately reference mark time-frequency resource in descending control domain under the shared mutually different condition in resource element position, base station and each relay station assigned references symbol running time-frequency resource for this reason; And the resource information of base station assigns is sent to described reference symbol sending module for this reason;
Described reference symbol sending module also is used for sending reference symbol on described reference mark time-frequency resource allocation module is the reference mark time-frequency resource of base station assigns.
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| CN200910006902A CN101800569A (en) | 2009-02-05 | 2009-02-05 | Method for transmitting reference marks and base station |
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| CN200910006902A CN101800569A (en) | 2009-02-05 | 2009-02-05 | Method for transmitting reference marks and base station |
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| CN102740463A (en) * | 2011-03-31 | 2012-10-17 | 上海贝尔股份有限公司 | Method, device, base station and user equipment for reducing interference in wireless communication system |
| WO2013044870A1 (en) * | 2011-09-29 | 2013-04-04 | Huawei Technologies Co., Ltd. | Wireless communication control channel systems and methods |
| CN103095632A (en) * | 2011-11-04 | 2013-05-08 | 中兴通讯股份有限公司 | Collocation method and device of carrier control domain |
| WO2017190566A1 (en) * | 2016-05-04 | 2017-11-09 | 上海朗帛通信技术有限公司 | Method and device for use in relay transmission in user equipment and base station |
| CN107994978A (en) * | 2012-05-11 | 2018-05-04 | 华为技术有限公司 | Reference signal processing method and user equipment, base station |
| CN110401516A (en) * | 2018-04-24 | 2019-11-01 | 上海朗帛通信技术有限公司 | A kind of first node that be used to wirelessly communicate, the method and apparatus in base station |
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2009
- 2009-02-05 CN CN200910006902A patent/CN101800569A/en active Pending
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| US9537623B2 (en) | 2011-03-31 | 2017-01-03 | Alcatel Lucent | Method, apparatus, base station and user equipment for reducing interference in a wireless communication system |
| CN102740463A (en) * | 2011-03-31 | 2012-10-17 | 上海贝尔股份有限公司 | Method, device, base station and user equipment for reducing interference in wireless communication system |
| CN103843433B (en) * | 2011-09-29 | 2017-12-29 | 华为技术有限公司 | Radio communication control channel system and method |
| CN103843433B9 (en) * | 2011-09-29 | 2018-02-23 | 华为技术有限公司 | wireless communication control channel system and method |
| US9008035B2 (en) | 2011-09-29 | 2015-04-14 | Futurewei Technologies, Inc. | Wireless communication control channel systems and methods |
| US9258815B2 (en) | 2011-09-29 | 2016-02-09 | Futurewei Technologies, Inc. | Wireless communication control channel apparatus and method |
| CN103843433A (en) * | 2011-09-29 | 2014-06-04 | 华为技术有限公司 | Wireless communication control channel systems and methods |
| US10200984B2 (en) | 2011-09-29 | 2019-02-05 | Futurewei Technologies, Inc. | Wireless communication control channel apparatus and method |
| WO2013044870A1 (en) * | 2011-09-29 | 2013-04-04 | Huawei Technologies Co., Ltd. | Wireless communication control channel systems and methods |
| CN103095632A (en) * | 2011-11-04 | 2013-05-08 | 中兴通讯股份有限公司 | Collocation method and device of carrier control domain |
| CN103095632B (en) * | 2011-11-04 | 2018-02-06 | 中兴通讯股份有限公司 | The collocation method and device of carrier control domain |
| CN107994978A (en) * | 2012-05-11 | 2018-05-04 | 华为技术有限公司 | Reference signal processing method and user equipment, base station |
| CN107994978B (en) * | 2012-05-11 | 2020-10-23 | 华为技术有限公司 | Reference signal processing method, user equipment and base station |
| WO2017190566A1 (en) * | 2016-05-04 | 2017-11-09 | 上海朗帛通信技术有限公司 | Method and device for use in relay transmission in user equipment and base station |
| CN110401516A (en) * | 2018-04-24 | 2019-11-01 | 上海朗帛通信技术有限公司 | A kind of first node that be used to wirelessly communicate, the method and apparatus in base station |
| CN110401516B (en) * | 2018-04-24 | 2021-10-29 | 上海朗帛通信技术有限公司 | Method and device used in first node and base station for wireless communication |
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Application publication date: 20100811 |