CN102064929A - Method, device and system for transmitting pilot of backhaul link - Google Patents
Method, device and system for transmitting pilot of backhaul link Download PDFInfo
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- CN102064929A CN102064929A CN 200910237688 CN200910237688A CN102064929A CN 102064929 A CN102064929 A CN 102064929A CN 200910237688 CN200910237688 CN 200910237688 CN 200910237688 A CN200910237688 A CN 200910237688A CN 102064929 A CN102064929 A CN 102064929A
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Abstract
The embodiment of the invention discloses a method, a device and a system for transmitting pilot of a backhaul link. The method comprises the following steps that: base station equipment configures the pilot density according to channel conditions in a downlink transmission area of a relay node; and the base station equipment transmits the pilot to the relay node through the downlink transmission area of the relay node according to the configured pilot density, wherein the base station equipment determines the downlink transmission area of the relay node, and configures different pilot densities according to different channel conditions; and the pilot is not limited to a communal reference signal (CRS) and also can be applied to a demodulation reference signal (DMRS). The pilot which is transmitted by the base station equipment to the relay node through the downlink transmission area of the relay node comprises the CRS and the DMRS, a relay node-physical downlink control channel (R-PDCCH) is divided into a frequency division multiplexing (FDM) mode and a time division multiplex (TDM) +FDM mode, and the relay node receives and detect the pilot and demodulates the pilot. The embodiment of the invention improves the demodulation performance of the R-PDCCH and/or a relay node-physical downlink shared channel (R-PDSCH).
Description
Technical field
The present invention relates to the mobile communication technology field, particularly relate to a kind of methods, devices and systems that transmit the back haul link pilot tone.
Background technology
Along with 3G (the 3rd Generation, 3G (Third Generation) Moblie) commercialization of technology, as the back 3G standard that great popular demand, LTE (Long Term Evolution, long evolving system) standard is near finishing, LTE-A (Long Term Evolution Advanced, advanced long-term evolution system) standardization effort also launches in full preparation.
LTE-A is a kind of technology of backward compatibility, complete compatible LTE.Wherein, relaying (Relay) technology is one of new technology of LTE-A introducing, is used to improve throughput of system and increases network coverage.In order to realize relaying technique, correspondingly introduced RN (Relay Node, via node) in the mobile communication system.As shown in Figure 1, be the mobile communication system schematic diagram behind the introducing RN, mainly comprise eNB (enhanced Node B, the enhancement mode Node B), RN and UE (User Equipment, subscriber equipment) three parts, wherein, eNB connects CN (Core Network by wireline interface, core net), RN connects eNB by wave point, and UE connects RN or eNB by wave point.Radio Link comprises following three: back haul link (backhaul link) between the direct projection link between eNB and the macro UE (direct link), eNB and the RN and the access link (access link) between RN and the relay UE, wherein, Macro UE accepts the service that eNB directly provides, and Relay UE accepts the service that RN provides.
Consider the signal interference-limited of radio communication, direct projection link, back haul link and access link need use the Radio Resource of quadrature.Because the mode of operation of the transceiver of RN is a half-duplex time-division mode of operation, the transmitter of RN has interference to the receiver of self, the operation that RN can not receive simultaneously and send on same frequency, promptly back haul link and access link are unsuitable for coexisting on same frequency resource.
In order to solve the coexistence problems between back haul link and the access link, make the communication network of introducing RN can compatible Rel-8 (Release 8, the 8th version) UE, and keep Relay UE to have identical frame structure with Macro UE, system introduces MBSFN (Multicast Broadcast Single FrequencyNetwork, multicast single frequency network) subframe.After the frame structure of RN is configured to the MBSFN subframe, there are 1 or 2 OFDM (Orthogonal Frequency Division Multiplexing, OFDM) the descending control signaling zone of symbol, this zone are used for RN and send descending control signaling to Relay UE.When RN received from the back haul link data of eNB, RN did not send data to Relay UE, promptly creates transmission gap (gaps) by the MBSFN subframe in the transmission time at descending access link, as shown in Figure 2.In transmission gap, UE (comprising Rel-8UE) can not expect any transfer of data from RN, eNB can utilize the descending back haul link transmission between interior subframe realization of this transmission gap and the RN, even the subframe of transmission gap is not used in the downlink data of transmission back haul link, can not be used for the downlink transfer of access link, thereby avoid back haul link to conflict with the downlink transfer between the access link.
As shown in Figure 3, be the transmission schematic diagram of MBSFN subframe, wherein, the control area of MBSFN subframe takies 1 or 2 OFDM symbols, is used for RN and transmits control signal to the UE of its service.In the downlink transfer of back haul link, RN can't receive control area PDCCH (the PhysicalDownlink Control Channel of base station, Physical Downlink Control Channel), therefore, the base station need be at PDSCH (Physical Downlink Shared Channel, Physical Downlink Shared Channel) zone is created one and is used for the zone that transmits control signal to RN, this zone is R-PDCCH (Relay Node-PhysicalDownlink Control Channel, the via node Physical Downlink Control Channel) zone, comprise R-PDCCH zone and R-PHICH (Relay Node-Physical HARQ Indicator Channel, the automatic repeat requests indicating channel of via node physical mixed) zone.
If R-PDCCH adopts FDM (Frequency Division Multiplexing in the zone, frequency division multiplex) mode, as shown in Figure 4, R-PDCCH zone, R-PDSCH (Relay Node-PhysicalDownlink Shared Channel, the via node Physical Downlink Shared Channel) PDSCH of zone and R8UE zone adopts the FDM mode to divide, and each zone takies one or more PRB.If R-PDCCH adopts TDM (Time Division Multiplexing in the zone, time division multiplexing)+and the FDM mode, as shown in Figure 5, the R-PDCCH zone takies one or more PRB (PhysicalResource Block at frequency domain, Physical Resource Block), take several OFDM symbols in time domain; Zone after the R-PDCCH zone is used for the R-PDSCH transmission, and other unappropriated PDSCH zones are used for the transmission of R8UE PDSCH and R-PDSCH by the FDM mode.
Comprise public guide frequency and special pilot frequency for user two class pilot tones in the LTE system, wherein, public guide frequency is that full bandwidth sends, and the ID of concrete configuration and sub-district (Identity, identity) is relevant, and promptly in a sub-district, the pattern of its public guide frequency is identical.Because PDCCH is that a plurality of users detect simultaneously, as seen its pilot tone must all be to all users, and is identical, and therefore, control channel PDCCH only can come demodulation by enough public guide frequencies, as shown in Figure 6, is the public guide frequency allocation plan of antenna port 0-3.Special pilot frequency for user is used to support the PDSCH transmission of single antenna port, as shown in Figure 7, is the DMRS in the LTE-A system (Demodulation Reference Signal, dedicated pilot) allocation plan.
On the back haul link between eNB and the RN, eNB uses special control channel R-PDCCH to the relevant control signaling of RN transmission.Wherein, R-PDCCH is positioned at PDSCH regional extent inside, can continue to use Rel-8CRS (Communal Reference Signal, public guide frequency) and decode.
The inventor is in realizing process of the present invention, and there are the following problems at least to find prior art:
When adopting four antenna ports to carry out downlink transfer in the base station, the R-PDCCH zone only can receive the CRS of a row port 2 and 3, and density is less, can't guarantee demodulation performance.
Summary of the invention
The embodiment of the invention provides a kind of methods, devices and systems that transmit the back haul link pilot tone, is used to improve the demodulation performance of R-PDCCH and/or R-PDSCH.
The embodiment of the invention proposes a kind of method of transmitting the back haul link pilot tone, may further comprise the steps:
Base station equipment is in via node downlink transfer zone, according to the density of channel condition configuration pilot tone;
Described base station equipment is transmitted pilot tone by described via node downlink transfer zone to via node according to the density of the pilot tone of described configuration.
Preferably, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
When channel condition was lower than default thresholding, described base station equipment increased the density of pilot tone in described via node downlink transfer zone;
When channel condition was higher than default thresholding, described base station equipment was in the density of described via node downlink transfer area decreases pilot tone.
Preferably, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
Described base station equipment is in the via node initial configuration stage, according to the density of channel condition configuration pilot tone, and described be configured in the subsequent applications constant.
Preferably, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
Described base station equipment is in the via node initial configuration stage, according to the density of channel condition configuration pilot tone, and in the use of described via node, according to the pilot density of the described via node of channel condition dynamic-configuration.
Preferably, described pilot tone comprises public guide frequency and/or dedicated pilot,
Described channel condition comprises any in the following content:
The signal to noise ratio of pilot channel, power system capacity and throughput of system.
Preferably, described via node downlink transfer zone comprises via node Physical Downlink Control Channel R-PDCCH zone and/or via node Physical Downlink Shared Channel R-PDSCH zone,
Described base station equipment increases the density of pilot tone in via node downlink transfer zone, specifically comprise:
Described base station equipment in the R-PDCCH zone and/or the R-PDSCH zone be that antenna port 2 and antenna port 3 increases by a row public guide frequency.
Preferably, a described row public guide frequency that increases for antenna port 2 and antenna port 3 is positioned on the 6th the orthogonal frequency division multiplex OFDM symbol of first slot s lot of descending sub frame of described base station equipment, and the public guide frequency of the antenna port 2 of the frequency domain position of a row public guide frequency of described increase and second slot of described descending sub frame and antenna port 3 intersects placement.
Preferably, a described row public guide frequency that increases for antenna port 2 and antenna port 3 is positioned on the 4th of first slot s lot of descending sub frame of described base station equipment or the 7th the OFDM symbol, and the public guide frequency of the antenna port 2 of the frequency domain position of a row public guide frequency of described increase and second slot of described descending sub frame and antenna port 3 intersects placement.
Preferably, described is the time-domain position and the frequency domain position of a row public guide frequency of antenna port 2 and antenna port 3 increases, relevant with cell configuration.
Preferably, when a described row public guide frequency for antenna port 2 and antenna port 3 increases was on the identical OFDM symbol with the 10th version dedicated pilot Rel-10DMRS, the frequency domain position of a row public guide frequency of described increase and the frequency domain position of described Rel-10DMRS staggered.
Preferably, described base station equipment, also comprises after via node transmission pilot tone by via node downlink transfer zone:
Described via node in the R-PDCCH zone and/or the R-PDSCH zone be received in public guide frequency and/or the dedicated pilot that described antenna port 2 and described antenna port 3 increases, and use described public guide frequency and/or dedicated pilot to carry out demodulation.
The embodiment of the invention also proposes a kind of method that receives pilot tone, comprising:
Via node obtains the density from the pilot tone of base station equipment, and receives the pilot tone from described base station equipment.
Preferably, described via node obtains the density from the pilot tone of described base station equipment, specifically comprises:
When described via node was the fixed relay node, described via node obtained the pilot density that described base station equipment disposes when disposing described via node;
When described via node was mobile via node, described via node received from the broadcast announcement that comprises pilot density information of described base station equipment or dedicated signaling notice, obtains described pilot density; Perhaps
Described via node obtains pilot frequency mode by blind check, and knows pilot density.
The embodiment of the invention also proposes a kind of base station equipment, comprising:
Configuration module is used in via node downlink transfer zone according to the density of channel condition configuration pilot tone;
Transport module is used for the density according to the pilot tone of described configuration module configuration, transmits pilot tone by described via node downlink transfer zone to via node.
Preferably, described configuration module specifically is used for increasing the density of pilot tone in described via node downlink transfer zone when channel condition is lower than default thresholding, when channel condition is higher than default thresholding, in the density of described via node downlink transfer area decreases pilot tone.
Preferably, described via node downlink transfer zone comprises R-PDCCH zone and/or R-PDSCH zone,
Described configuration module specifically is used in the R-PDCCH zone and/or the R-PDSCH zone is antenna port 2 and antenna port 3 increases by one row public guide frequency.
Preferably, described base station equipment also comprises:
Notification module is used for sending broadcast announcement or the dedicated signaling notice that comprises pilot density information to described via node, notifies described via node with the pilot density of described configuration module configuration.
The embodiment of the invention also proposes a kind of system of transmitting the back haul link pilot tone, comprising:
Base station equipment is used in via node downlink transfer zone, according to the density of channel condition configuration pilot tone; And, transmit pilot tone to via node by described via node downlink transfer zone according to the density of the pilot tone of described configuration;
Via node is used for receiving pilot tone in described via node downlink transfer zone, and uses described pilot tone to carry out demodulation.
Preferably, described via node also is used to obtain the density from the pilot tone of described base station equipment.
Preferably, described via node specifically is used for when described via node is the fixed relay node, obtains the pilot density that described base station equipment disposes when disposing described via node;
When described via node is mobile via node, receive broadcast announcement that comprises pilot density information or dedicated signaling notice from described base station equipment, obtain described pilot density; Perhaps
Obtain pilot frequency mode by blind check, and know pilot density.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increase the public guide frequency density of antenna port 2 and 3 in via node downlink transfer zone, thereby guaranteed the demodulation performance of R-PDCCH and/or R-PDSCH.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the mobile communication system schematic diagram behind the introducing RN;
Fig. 2 carries out back haul link downlink transfer schematic diagram for utilizing the MBSFN subframe;
Fig. 3 is the transmission schematic diagram of MBSFN subframe;
Fig. 4 is the R-PDCCH area schematic of FDM mode;
Fig. 5 is the R-PDCCH area schematic of TDM+FDM mode;
Fig. 6 is the public guide frequency allocation plan of antenna port 0-3;
Fig. 7 is the DMRS allocation plan in the LTE-A system;
Fig. 8 is a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention one;
Fig. 9 is a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention two;
Increase pilot density schematic diagram when Figure 10 is normal subframe, R-PDCCH zone employing FDM mode for descending sub frame;
Figure 11 is a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention three;
Increase pilot density schematic diagram when Figure 12 is normal subframe, R-PDCCH zone employing TDM+FDM mode for descending sub frame;
Increase pilot density schematic diagram when Figure 13 is MBSFN subframe, R-PDCCH zone employing FDM mode for descending sub frame;
Increase pilot density schematic diagram when Figure 14 is MBSFN subframe, R-PDCCH zone employing TDM+FDM mode for descending sub frame;
Minimizing pilot density schematic diagram when Figure 15 is normal subframe, R-PDCCH zone employing TDM+FDM mode for descending sub frame;
Minimizing pilot density schematic diagram when Figure 16 is normal subframe, R-PDCCH zone employing FDM mode for descending sub frame;
Minimizing pilot density schematic diagram when Figure 17 is the regional FDM of employing of normal subframe, R-PDCCH zone and R-PDSCH mode for descending sub frame;
Figure 18 is a kind of base station equipment structural representation in the embodiment of the invention four;
Figure 19 is a kind of system configuration schematic diagram that transmits the back haul link pilot tone in the embodiment of the invention five.
Embodiment
The embodiment of the invention is at the transmission of the public guide frequency on the backhaul link, and the CRS transmission plan on the designing antenna port 2 and 3 in RN descending control transmission zone and/or RN downlink data transmission zone, is that antenna port 2 and 3 increases by a row public guide frequency.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
As shown in Figure 8, a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention one may further comprise the steps:
Particularly, when channel condition was lower than default thresholding, base station equipment increased the density of pilot tone in described via node downlink transfer zone; When channel condition was higher than default thresholding, base station equipment was in the density of described via node downlink transfer area decreases pilot tone.Wherein, base station equipment can dispose the density of pilot tone according to channel condition, and this is configured in the subsequent applications constant in the via node initial configuration stage; Also can be in the via node initial configuration stage, according to the density of channel condition configuration pilot tone, and in the use of described via node, according to the pilot density of the described via node of channel condition dynamic-configuration.
Wherein, pilot tone comprises public guide frequency and/or dedicated pilot, and channel condition comprises any in the following content: the signal to noise ratio of pilot channel, power system capacity and throughput of system.Via node downlink transfer zone comprises R-PDCCH zone and/or R-PDSCH zone, and base station equipment can be in the R-PDCCH zone and/or the R-PDSCH zone, is that antenna port 2 and antenna port 3 increase by a row public guide frequency.The time-domain position and the frequency domain position of a row public guide frequency that increases for antenna port 2 and antenna port 3 are relevant with cell configuration.When a row public guide frequency that increases for antenna port 2 and antenna port 3 was on the identical OFDM symbol with Rel-10DMRS, the frequency domain position of a row public guide frequency of this increase and the frequency domain position of Rel-10DMRS staggered.
Particularly, base station equipment is passed through public guide frequency and/or the dedicated pilot after R-PDCCH zone and/or the R-PDSCH zone transmission configuration, via node can be in the R-PDCCH zone and/or the R-PDSCH zone be received in public guide frequency and/or the dedicated pilot that antenna port 2 and antenna port 3 increase, and use this public guide frequency and/or dedicated pilot to carry out demodulation.
In addition, via node can also obtain the density from the pilot tone of base station equipment.Particularly, when the relaying node was the fixed relay node, via node obtained the pilot density that base station equipment disposes when disposing this via node; When the relaying node was mobile via node, via node received from the broadcast announcement that comprises pilot density information of base station equipment or dedicated signaling notice, obtains described pilot density; Perhaps via node obtains pilot frequency mode by blind check, and knows pilot density.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, in the public guide frequency of via node downlink transfer area configurations antenna port 2 and 3 and/or the density of dedicated pilot, thereby guaranteed the demodulation performance of R-PDCCH and/or R-PDSCH.
Below in conjunction with concrete application scenarios, the method for the transmission back haul link pilot tone that proposes in the embodiment of the invention is described in detail.
When the descending sub frame of base station equipment was normal (common) subframe, base station equipment sent CRS and DMRS on full bandwidth, and CRS pattern (pattern) and DMRS pattern are respectively as shown in Figure 6 and Figure 7.Base station equipment is the time-domain position of the row public guide frequency that increases of antenna port 2 and antenna port 3, can be any row in 11 OFDM symbols in R-PDCCH zone and/or R-PDSCH zone.But consider the density of frequency domain CRS, if a row public guide frequency that will increase is placed on the OFDM symbol of the CRS that has placed antenna port 0,1,2 and 3, frequency domain CRS density is with excessive.
Remove the 4 row OFDM symbols of the CRS that has placed antenna port 0,1,2,3, also remaining 7 the OFDM symbols of subframe can be selected.Because at second slot (time slot), there has been a row pilot tone in antenna port 2 and 3, so that a row public guide frequency that increases is placed on first slot is proper.In first slot, also remaining l=3,5,6 can place pilot tone, l=3,5,6 all is the position of admissible placement public guide frequency, can select the more excellent a kind of configuration mode of performance by emulation.When l=5 compared with l=6, if increase CRS at l=6, and the density between the CRS of second slot middle port 2,3 was too big, so the performance of l=5 is more better, and can be with l=5 as a kind of configuration mode.
In addition, be the frequency domain position of antenna port 2 and 3 row public guide frequencies that increase, need defer to the basic principle of Rel-8CRS, the CRS intersection of the row public guide frequency that assurance increases and second time slot of antenna port 2 and 3 is placed.
As shown in Figure 9, be a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention two, wherein, the descending sub frame of base station equipment is the normal subframe, and R-PDCCH adopts the FDM mode in the zone, and this method may further comprise the steps:
Particularly, can suppose to have 4 PRB, R-PDCCH zone and R-PDSCH zone adopt the frequency division mode respectively to account for a PRB.Wherein, R-PDSCH adopts in the zone DMRS demodulation to get final product, and not needing increases CRS for antenna port 2 and 3; And there is not DMRS in the R-PDCCH zone, need increase by a row CRS for antenna port 2 and 3.A row CRS who increases is positioned on the 6th symbol of first slot, i.e. l=5, and another row CRS with antenna port 2 and 3 on frequency domain staggers, as shown in figure 10.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increases the public guide frequency density of antenna port 2 and 3 in the R-PDCCH zone, thereby has guaranteed the demodulation performance of R-PDCCH.
As shown in figure 11, be a kind of method flow diagram that transmits the back haul link pilot tone in the embodiment of the invention three, wherein, the descending sub frame of base station equipment is the normal subframe, and R-PDCCH adopts the TDM+FDM mode in the zone, and this method may further comprise the steps:
Particularly, can suppose to have 4 PRB, R-PDCCH zone and R-PDSCH zone take two PRB altogether, wherein, the R-PDCCH zone takies back four OFDM symbols of first slot in two PRB, therefore, the DMRS in the R-PDCCH zone will not exist, and need be antenna port 2 and antenna port 3 increases by one row CRS.The CRS that increase for antenna port 2 and 3 are positioned at the 6th symbol of first slot, i.e. l=5, and another row CRS with antenna port 2 and 3 on frequency domain staggers, as shown in figure 12.
Need to prove, when the R-PDCCH zone takies the OFDM symbol at DMRS place, and during the DMRS normal presence,, need avoid the RE at DMRS place if when a row CRS who increases takies the OFDM symbol at DMRS place.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increase the public guide frequency density of antenna port 2 and 3 at R-PDCCH and R-PDSCH zone, thereby guaranteed the demodulation performance of R-PDCCH and R-PDSCH.
Another kind of application scenarios as the embodiment of the invention, if the descending sub frame of base station equipment is the MBSFN subframe, base station equipment only sends CRS to R8UE on preceding two OFDM symbols, there is R8CRS in the R-PDCCH zone, will has DMRS in zone and the R-PDSCH zone of scheduling R10UE PDSCH.
When the FDM mode is adopted in the R-PDCCH zone, suppose to have 4 PRB, R8UE PDSCH zone, R10UE PDSCH zone, R-PDCCH zone and R-PDSCH zone adopt the mode of frequency division to take a PRB respectively, wherein, to there be any RS in the R8UE PDSCH zone, there are DMRS in R10UE PDSCH zone and R-PDSCH zone, and there is CRS in the R-PDCCH zone.Be positioned on the 6th the OFDM symbol of first slot for antenna port 2 and 3 CRS that increase in R-PDCCH zone, i.e. l=5, another row CRS with antenna port 2 and 3 on frequency domain staggers, as shown in figure 13.
When the TDM+FDM mode is adopted in the R-PDCCH zone, suppose to have 4 PRB, R8UEPDSCH zone and R10UE PDSCH zone respectively account for a PRB respectively, R-PDCCH zone and R-PDSCH zone take two PRB altogether, and wherein, there is not any RS in R8UE PDSCH in the zone, R10UE PDSCH region memory is at DMRS, take back four OFDM symbols of first slot on the time domain of R-PDCCH zone in two PRB, therefore, the DMRS in the R-PDCCH zone will not exist.The CRS that increases for antenna port 2,3 is positioned at the 6th symbol of first slot, i.e. l=5, and another row CRS with antenna port 2,3 on frequency domain staggers, as shown in figure 14.
Need to prove, when the R-PDCCH zone takies the OFDM symbol at DMRS place, and during the DMRS normal presence,, need avoid the RE at DMRS place if when a row CRS who increases takies the OFDM symbol at DMRS place.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increase the public guide frequency density of antenna port 2 and 3 at R-PDCCH and/or R-PDSCH zone, thereby guaranteed the demodulation performance of R-PDCCH and/or R-PDSCH.
In another application scenarios of the embodiment of the invention, when channel condition is better, promptly be higher than when presetting thresholding, base station equipment can also be in the density of via node downlink transfer area decreases pilot tone.
For example, if the descending sub frame of base station equipment is the Normal subframe, R-PDCCH adopts the TDM+FDM mode in the zone, when the backhaul channel condition is better, can deduct the pilot tone of 2 subcarrier upper port 3, as shown in figure 15.Wherein, have 4 PRB, R-PDCCH zone and R-PDSCH zone take 2 PRB altogether, and the R-PDCCH zone takies back 4 OFDM symbols of the 1st slot in 2 PRB.
If the descending sub frame of base station equipment is the Normal subframe, R-PDCCH adopts the FDM mode in the zone, when the backhaul channel condition is better, can deduct the pilot tone of 1 subcarrier upper port 2, as shown in figure 16.Wherein, have 4 PRB, R-PDCCH zone and R-PDSCH zone adopt the frequency division mode respectively to account for 1 PRB.
If the descending sub frame of base station equipment is the Normal subframe, the FDM mode is adopted in R-PDCCH zone and R-PDSCH zone, when the backhaul channel condition is better, reduce the density of the DMRS in the R-PDSCH zone, promptly reduce among second slot, 6th, the DMRS on 7 OFDM symbols, as shown in figure 17.
As shown in figure 18, a kind of base station equipment structural representation in the embodiment of the invention four comprises:
Configuration module 410 is used in via node downlink transfer zone according to the density of channel condition configuration pilot tone.
Particularly, above-mentioned configuration module 410 specifically is used for increasing the density of pilot tone in described via node downlink transfer zone when channel condition is lower than default thresholding, when channel condition is higher than default thresholding, in the density of described via node downlink transfer area decreases pilot tone.Wherein, pilot tone comprises public guide frequency and/or dedicated pilot, and channel condition comprises any in the following content: the signal to noise ratio of pilot channel, power system capacity and throughput of system.
In addition, via node downlink transfer zone comprises R-PDCCH zone and/or R-PDSCH zone.Above-mentioned configuration module 410 specifically is used in the R-PDCCH zone and/or the R-PDSCH zone is antenna port 2 and antenna port 3 increases by one row public guide frequency.
Transport module 420 is used for the density according to the pilot tone of configuration module 410 configurations, transmits pilot tone by described via node downlink transfer zone to via node.
Notification module 430 is used for sending broadcast announcement or the dedicated signaling notice that comprises pilot density information to described via node, notifies described via node with the pilot density of described configuration module 410 configurations.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increase the public guide frequency density of antenna port 2 and 3 in via node downlink transfer zone, thereby guaranteed the demodulation performance of R-PDCCH and/or R-PDSCH.
As shown in figure 19, a kind of system configuration schematic diagram that transmits the back haul link pilot tone in the embodiment of the invention five comprises base station equipment 510 and via node 520, wherein,
Via node 520 is used for receiving pilot tone in described via node downlink transfer zone, and uses described pilot tone to carry out demodulation.
Wherein, via node downlink transfer zone comprises R-PDCCH zone and/or R-PDSCH zone.Above-mentioned via node 520 specifically is used in the R-PDCCH zone and/or the R-PDSCH zone is received in the public guide frequency of antenna port 2 and antenna port 3 increases, and uses described public guide frequency to carry out demodulation.
In addition, via node 520 also is used to obtain the density from the pilot tone of base station equipment 510.Particularly, described via node 520 specifically is used for when described via node is the fixed relay node, obtains the pilot density that described base station equipment disposes when disposing described via node; When described via node is mobile via node, receive broadcast announcement that comprises pilot density information or dedicated signaling notice from described base station equipment, obtain described pilot density; Perhaps obtain pilot frequency mode, and know pilot density by blind check.
The technical scheme of the embodiment of the invention has the following advantages, because on the basis that utilizes Rel-8CRS demodulation R-PDCCH, increase the public guide frequency density of antenna port 2 and 3 in via node downlink transfer zone, thereby guaranteed the demodulation performance of R-PDCCH and/or R-PDSCH.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a station terminal equipment (can be mobile phone, personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be looked protection scope of the present invention.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be integrated in one, and also can separate deployment, can merge into a module, also can further split into a plurality of submodules.
The invention described above embodiment sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (20)
1. a back haul link pilot frequency transmission method is characterized in that, may further comprise the steps:
Base station equipment is in via node downlink transfer zone, according to the density of channel condition configuration pilot tone;
Described base station equipment is transmitted pilot tone by described via node downlink transfer zone to via node according to the density of the pilot tone of described configuration.
2. the method for claim 1 is characterized in that, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
When channel condition was lower than default thresholding, described base station equipment increased the density of pilot tone in described via node downlink transfer zone;
When channel condition was higher than default thresholding, described base station equipment was in the density of described via node downlink transfer area decreases pilot tone.
3. the method for claim 1 is characterized in that, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
Described base station equipment is in the via node initial configuration stage, according to the density of channel condition configuration pilot tone, and described be configured in the subsequent applications constant.
4. the method for claim 1 is characterized in that, described base station equipment is in via node downlink transfer zone, and the density according to channel condition configuration pilot tone specifically comprises:
Described base station equipment is in the via node initial configuration stage, according to the density of channel condition configuration pilot tone, and in the use of described via node, according to the pilot density of the described via node of channel condition dynamic-configuration.
5. method as claimed in claim 2 is characterized in that described pilot tone comprises public guide frequency and/or dedicated pilot,
Described channel condition comprises any in the following content:
The signal to noise ratio of pilot channel, power system capacity and throughput of system.
6. method as claimed in claim 5 is characterized in that, described via node downlink transfer zone comprises via node Physical Downlink Control Channel R-PDCCH zone and/or via node Physical Downlink Shared Channel R-PDSCH zone,
Described base station equipment increases the density of pilot tone in via node downlink transfer zone, specifically comprise:
Described base station equipment in the R-PDCCH zone and/or the R-PDSCH zone be that antenna port 2 and antenna port 3 increases by a row public guide frequency.
7. method as claimed in claim 6, it is characterized in that, a described row public guide frequency that increases for antenna port 2 and antenna port 3 is positioned on the 6th the orthogonal frequency division multiplex OFDM symbol of first slot s lot of descending sub frame of described base station equipment, and the public guide frequency of the antenna port 2 of the frequency domain position of a row public guide frequency of described increase and second slot of described descending sub frame and antenna port 3 intersects placement.
8. method as claimed in claim 6, it is characterized in that, a described row public guide frequency that increases for antenna port 2 and antenna port 3 is positioned on the 4th of first slot s lot of descending sub frame of described base station equipment or the 7th the OFDM symbol, and the public guide frequency of the antenna port 2 of the frequency domain position of a row public guide frequency of described increase and second slot of described descending sub frame and antenna port 3 intersects placement.
9. method as claimed in claim 6 is characterized in that, described is the time-domain position and the frequency domain position of a row public guide frequency of antenna port 2 and antenna port 3 increases, relevant with cell configuration.
10. method as claimed in claim 6, it is characterized in that, when a described row public guide frequency for antenna port 2 and antenna port 3 increases was on the identical OFDM symbol with the 10th version dedicated pilot Rel-10DMRS, the frequency domain position of a row public guide frequency of described increase and the frequency domain position of described Rel-10DMRS staggered.
11. method as claimed in claim 6 is characterized in that, described base station equipment, also comprises after via node transmission pilot tone by via node downlink transfer zone:
Described via node in the R-PDCCH zone and/or the R-PDSCH zone be received in public guide frequency and/or the dedicated pilot that described antenna port 2 and described antenna port 3 increases, and use described public guide frequency and/or dedicated pilot to carry out demodulation.
12. a method that receives pilot tone is characterized in that, comprising:
Via node obtains the density from the pilot tone of base station equipment, and receives the pilot tone from described base station equipment.
13. method as claimed in claim 12 is characterized in that, described via node obtains the density from the pilot tone of base station equipment, specifically comprises:
When described via node was the fixed relay node, described via node obtained the pilot density that described base station equipment disposes when disposing described via node;
When described via node was mobile via node, described via node received from the broadcast announcement that comprises pilot density information of described base station equipment or dedicated signaling notice, obtains described pilot density; Perhaps
Described via node obtains pilot frequency mode by blind check, and knows pilot density.
14. a base station equipment is characterized in that, comprising:
Configuration module is used in via node downlink transfer zone according to the density of channel condition configuration pilot tone;
Transport module is used for the density according to the pilot tone of described configuration module configuration, transmits pilot tone by described via node downlink transfer zone to via node.
15. base station equipment as claimed in claim 14 is characterized in that,
Described configuration module specifically is used for increasing the density of pilot tone in described via node downlink transfer zone when channel condition is lower than default thresholding, when channel condition is higher than default thresholding, in the density of described via node downlink transfer area decreases pilot tone.
16. base station equipment as claimed in claim 15 is characterized in that, described via node downlink transfer zone comprises R-PDCCH zone and/or R-PDSCH zone,
Described configuration module specifically is used in the R-PDCCH zone and/or the R-PDSCH zone is antenna port 2 and antenna port 3 increases by one row public guide frequency.
17. base station equipment as claimed in claim 14 is characterized in that, also comprises:
Notification module is used for sending broadcast announcement or the dedicated signaling notice that comprises pilot density information to described via node, notifies described via node with the pilot density of described configuration module configuration.
18. a system of transmitting the back haul link pilot tone is characterized in that, comprising:
Base station equipment is used in via node downlink transfer zone, according to the density of channel condition configuration pilot tone; And, transmit pilot tone to via node by described via node downlink transfer zone according to the density of the pilot tone of described configuration;
Via node is used for receiving pilot tone in described via node downlink transfer zone, and uses described pilot tone to carry out demodulation.
19. system as claimed in claim 18 is characterized in that,
Described via node also is used to obtain the density from the pilot tone of described base station equipment.
20. system as claimed in claim 19 is characterized in that,
Described via node specifically is used for when described via node is the fixed relay node, obtains the pilot density that described base station equipment disposes when disposing described via node;
When described via node is mobile via node, receive broadcast announcement that comprises pilot density information or dedicated signaling notice from described base station equipment, obtain described pilot density; Perhaps
Obtain pilot frequency mode by blind check, and know pilot density.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910237688 CN102064929B (en) | 2009-11-16 | 2009-11-16 | Method, device and system for transmitting pilot of backhaul link |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910237688 CN102064929B (en) | 2009-11-16 | 2009-11-16 | Method, device and system for transmitting pilot of backhaul link |
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| CN102064929A true CN102064929A (en) | 2011-05-18 |
| CN102064929B CN102064929B (en) | 2013-09-25 |
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| CN 200910237688 Active CN102064929B (en) | 2009-11-16 | 2009-11-16 | Method, device and system for transmitting pilot of backhaul link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015168940A1 (en) * | 2014-05-09 | 2015-11-12 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN104012061B (en) * | 2011-11-01 | 2017-08-15 | Lg电子株式会社 | Method and wireless device for monitoring control channel |
| CN110830226A (en) * | 2016-02-16 | 2020-02-21 | 高通股份有限公司 | Downlink operation with shortened transmission time interval |
| US10616910B2 (en) | 2015-03-03 | 2020-04-07 | Huawei Technologies Co., Ltd. | Uplink data transmission method and apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101383656A (en) * | 2007-09-05 | 2009-03-11 | 中兴通讯股份有限公司 | Method and device for optimizing pilot based on speed and channel quality indication |
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- 2009-11-16 CN CN 200910237688 patent/CN102064929B/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104012061B (en) * | 2011-11-01 | 2017-08-15 | Lg电子株式会社 | Method and wireless device for monitoring control channel |
| WO2015168940A1 (en) * | 2014-05-09 | 2015-11-12 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN110401520A (en) * | 2014-05-09 | 2019-11-01 | 华为技术有限公司 | Demodulated reference signal configuration method, device, base station and user equipment |
| CN110460417A (en) * | 2014-05-09 | 2019-11-15 | 华为技术有限公司 | Demodulated reference signal configuration method, device, base station and user equipment |
| CN110401520B (en) * | 2014-05-09 | 2020-10-16 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| CN110460417B (en) * | 2014-05-09 | 2020-10-27 | 华为技术有限公司 | Demodulation reference signal configuration method and device, base station and user equipment |
| US10616910B2 (en) | 2015-03-03 | 2020-04-07 | Huawei Technologies Co., Ltd. | Uplink data transmission method and apparatus |
| US11265899B2 (en) | 2015-03-03 | 2022-03-01 | Huawei Technologies Co., Ltd. | Uplink data transmission method and apparatus |
| CN110830226A (en) * | 2016-02-16 | 2020-02-21 | 高通股份有限公司 | Downlink operation with shortened transmission time interval |
| CN110830226B (en) * | 2016-02-16 | 2022-10-28 | 高通股份有限公司 | Downlink operation with shortened transmission time interval |
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| Publication number | Publication date |
|---|---|
| CN102064929B (en) | 2013-09-25 |
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