CN110620606B

CN110620606B - Communication method and device in large-scale MIMO

Info

Publication number: CN110620606B
Application number: CN201910834904.7A
Authority: CN
Inventors: 张晓博
Original assignee: Shanghai Langbo Communication Technology Co Ltd
Current assignee: Shanghai Langbo Communication Technology Co Ltd
Priority date: 2015-11-27
Filing date: 2015-11-27
Publication date: 2022-11-25
Anticipated expiration: 2035-11-27
Also published as: WO2017088661A1; CN106851826A; CN110620606A; CN106851826B

Abstract

The invention provides a communication method and device in large-scale MIMO. In one embodiment, the UE receives L downlink signals on L time-frequency resources, where the L downlink signals are sent by L cells, respectively. The frequency bands of the L cells that can be used for downlink transmission are wholly or partially overlapped, the downlink signal includes at least one of { downlink data and downlink control signaling }, L is a positive integer greater than 1, and the L time-frequency resources are orthogonal pairwise. By using the technical scheme provided by the invention, the coverage problem of the broadcast signals sent by the multi-antenna base station is avoided, the inter-cell interference is reduced, the traffic among the cells is balanced, the overhead of physical layer signaling is reduced, and the transmission efficiency is improved.

Description

Communication method and device in large-scale MIMO

The present application is a divisional application of the following original applications:

application date of the original application: 11/27/2015

- -application number of the original application: 201510852656.0

The invention of the original application is named: communication method and device in large-scale MIMO

Technical Field

The present invention relates to a scheme for simultaneously maintaining connection between a UE (User Equipment) and multiple cells in the technical field of mobile communication, and in particular, to a scheme for simultaneously maintaining connection between a UE and multiple cells in a scenario in which multiple antennas are deployed at a base station side.

Background

In conventional 3GPP-3rd Generation Partner Project (3 GPP-3rd Generation Partner Project) cellular network systems, a UE can typically only maintain a connection with one serving cell on a given carrier. The scenario that the UE and the plurality of serving cells keep connected comprises the following steps:

CoMP (Coordinated Multiple Point) JT (Joint Transmission)

Carrier Aggregation

Double connection (Dual Connectivity)

Soft Handover (Soft Handover)

CoMP JT is transparent to the UE and requires an ideal backhaul link between multiple cells participating in cooperation. In carrier aggregation and dual connectivity, multiple serving cells are deployed on different carriers, respectively. Soft handover is only applied to CDMA (Code Division Multiple Access) systems and occurs only when a user performs handover, and furthermore, a UE can maintain connection with two cells at the same time at most in soft handover.

Massive MIMO has recently become a research hotspot as a new cellular network antenna architecture. A typical characteristic of the Massive MIMO system is that a series of gains are obtained by increasing the number of antenna array elements to a larger value, for example, the system capacity theoretically continuously increases as the number of antennas increases; coherent superposition of transmit antenna signals reduces transmit power, and so on. A typical application scenario of Massive MIMO is to improve spectral efficiency by increasing the number of spatial multiplexing multiple users.

One challenge faced by Massive MIMO is the transmission of broadcast channel/cell common reference signals. Due to the fact that the maximum transmission power of a single antenna is low, the reception quality of the UE far away from the base station is difficult to guarantee by adopting the single antenna to transmit the broadcast channel/cell common reference signal. And multiple antennas jointly transmit the broadcast channel/cell common reference signal, which may cause coverage holes.

Another problem with Massive MIMO is that the UE may be interfered by neighboring base stations (caused by, e.g., pilot pollution), i.e., the beams generated by the multiple antennas through beamforming may cause strong interference to the UE of neighboring cells.

The present invention discloses a solution to the above problems. It should be noted that, without conflict, the embodiments and features in the embodiments in the UE (User Equipment) of the present application may be applied to the base station, and vice versa. Further, the embodiments and features of the embodiments of the present application may be arbitrarily combined with each other without conflict.

Disclosure of Invention

In a conventional broadband system, it is difficult for a UE to maintain connection with multiple cells on the same frequency band, for reasons including:

the path loss between the UE and the non-serving cell is large and the quality of service that the non-serving cell can provide to the UE is relatively low

When the backhaul link between the serving cell and the non-serving cell is non-ideal, the scheduling of the serving cell and the scheduling of the non-serving cell are performed independently, which may generate strong interference on the UE side.

The inventors have found through research that when the number of antennas configured on the base station side is large, the base station may provide better service quality to UEs in neighboring cells through beamforming. The inventors have further investigated that due to the low dependency of Massive MIMO on frequency selective scheduling, resource scheduling between multiple cells can be coordinated through the backhaul link-even if the backhaul link is non-ideal. The above discovery provides the possibility for the UE to stay connected on the same carrier and multiple cells.

According to the above analysis, the present invention discloses a method in a UE supporting multi-cell connection, wherein the method comprises the following steps:

step a. Receiving L downlink signals on L time-frequency resources, respectively, the L downlink signals being sent by L cells, respectively.

The frequency bands of the L cells that can be used for downlink transmission are wholly or partially overlapped, the downlink signal includes at least one of { downlink data and downlink control signaling }, and L is a positive integer greater than 1.

As an example, the orthogonal means not overlapping.

As an embodiment, the downlink frequency bands of the L cells are completely overlapped.

As an embodiment, any two of the L time-frequency resources are orthogonal.

As an embodiment, the downlink transmission between the UE and the L cells respectively adopts an OFDM or F-OFDM scheme.

As an embodiment, the time-frequency Resource includes a positive integer number of PRB (Physical Resource Block) Pair.

As an embodiment, the L time-frequency resources are L frequency bands in a system bandwidth of one carrier, respectively, and any two frequency bands in the L frequency bands are non-overlapping.

As an embodiment, the time-frequency resource includes a positive integer number of basic scheduling units, and the duration of the basic scheduling units in the time domain is not more than 1 millisecond and the duration of the basic scheduling units in the frequency domain is not less than 180kHz.

As an embodiment, the UE is in an RRC connected state.

As an embodiment, the UE receives system information only from a first cell among the L cells. As a sub-embodiment, the system information includes paging information.

The essence of the method is that the UE and a plurality of cells are simultaneously connected on an overlapped frequency band, so that the throughput of the UE can be improved on one hand, and the inter-cell interference can be avoided on the other hand. Especially when the traffic between the adjacent cells is unbalanced, the relatively idle cells can share the traffic for the relatively busy cells, thereby significantly improving the transmission efficiency of the system.

Specifically, according to an aspect of the present invention, the step a further includes the steps of:

step A0. receives K sets of identification signals, which are transmitted by K cells, respectively.

Wherein, L identification signal groups in the K identification signal groups are respectively sent by the L cells, one identification signal group comprises a positive integer number of identification signals, one sending of the identification signals occupies a positive integer number of time windows, the identification signals comprise one or more of { Zadoff-Chu sequence, pseudo-random sequence, RS resource and broadcast information }, the broadcast information comprises the index of the identification signals, and the RS resource comprises a positive integer number of RS ports.

In the present invention, an RS port refers to an air interface resource occupied by an RS transmitted by an antenna port.

The essence of the above aspect is that one cell can transmit a plurality of identification signals, and the plurality of identification signals can cover different areas by an antenna virtualization method, so as to avoid coverage blind areas of broadcast signals. Further, the directionality of a given identification signal may be stronger, enabling extended coverage and reduced inter-cell interference of broadcast signals.

As an embodiment, at least one of the K identification signal groups includes identification signals with a number greater than 1.

As an embodiment, the identification signal is transmitted periodically.

As an embodiment, the UE assumes that the identification signal is transmitted a single time (One-Shot), i.e. the UE cannot perform joint channel estimation using identification signals received multiple times.

As an embodiment, the number of identification signals included in at least 2 of the L identification signal groups is different.

As an embodiment, the positive integer number of time windows is consecutive.

As one embodiment, the time window is an LTE subframe.

As an embodiment, any two identification signals of the set of identification signals are transmitted in different time windows.

As one embodiment, the time window is an LTE time slot.

As an embodiment, the time window is a short TTI of less than 1 millisecond.

As an embodiment, the identification signals in the identification signal group share at least one of { Zadoff-Chu sequence, pseudo-random sequence, RS sequence corresponding to RS resource }.

As an embodiment, different identification sequences in the set of identification signals are transmitted by different antenna port(s).

As an embodiment, RS resources included in any two identification signals in the identification signal group are distributed in different time windows, or occupy different resource units in the same time window, where the resource units occupy one wideband symbol in the time domain and one subcarrier in the frequency domain. As a sub-embodiment, the Resource unit is LTE RE (Resource Element). As a sub-embodiment, the bandwidth of the sub-carriers is greater than 15kHz. As a sub-embodiment, the wideband symbol is one of { OFDM symbol, SC-FDMA symbol, F-OFDM symbol }.

As an embodiment, the REs occupied by the RS ports in the LTE subframe are REs occupied by one CSI-RS port in the LTE subframe.

As an embodiment, the REs occupied by the RS resources in the LTE subframe are REs occupied by one CSI-RS resource in the LTE subframe.

-a step a1 of receiving L downlink information, the L downlink information indicating L time-frequency resources, respectively.

As an embodiment, the L pieces of downlink information are sent by a first cell, where the first cell is a primary serving cell of the UE. That is, the UE receives only system information or paging information of the first cell on the carrier where the first cell is located. As a sub-embodiment of this embodiment, the L pieces of downlink information are indicated by a higher layer signaling.

The essence of the above embodiment is: the L time frequency resources can be configured in advance, and therefore interference among cells is reduced. Considering that Massive MIMO is not sensitive to frequency scheduling, the above pre-configuration does not significantly reduce spectral efficiency.

As an embodiment, the first cell is one of the L cells.

As an embodiment, the L pieces of downlink information are respectively sent by the L cells. As a sub-embodiment of this embodiment, the L downlink information are respectively indicated by downlink control signaling in the L downlink signals.

In particular, according to one aspect of the present invention, the step a further includes the steps of:

a step a2 of determining K channel qualities from the K subsets of identification signals, respectively.

Wherein the K identification signal subgroups are subsets of the K identification signal groups, respectively, the identification signal subgroups comprising a positive integer number of identification signals.

As an embodiment, the L channel qualities corresponding to the L cells are the highest L channel qualities of the K channel qualities.

The essence of the above aspect is that the UE is able to select the serving cell(s) based on the reception quality of the directionally transmitted broadcast signal.

As an embodiment, the subset of identification signals comprises only 1 identification signal.

As an embodiment, the subset of identification signals consists of a positive integer number of identification signals with the largest first parameter in the corresponding set of identification signals. Namely: the first parameter of any identification signal in a given subset of identification signals is greater than the first parameter of a reference identification signal, which is any identification signal in the corresponding set of identification signals other than the given subset of identification signals.

a step A3. Sending L-1 uplink messages.

Wherein the L-1 uplink information respectively indicates L-1 cells excluding a first cell from the L cells, the first cell is a main serving cell of the UE, the uplink information includes at least the former of { cell index, index of target identification signal }, and the target identification signal is one of the identification signal groups transmitted by the corresponding cell.

As an embodiment, the L receivers of the uplink information are the first cell.

As an embodiment, the target identification signal is the identification signal with the best channel quality in the corresponding identification signal group.

As an embodiment, the Cell index is a PCI (Physical Cell ID) of a Cell.

Specifically, according to an aspect of the present invention, the downlink signal includes { downlink data, downlink control signaling }, and the downlink control signaling includes scheduling information of the downlink data except for the time-frequency resource.

As an embodiment, the downlink control signaling is physical layer signaling.

As an embodiment, the downlink control signaling is scheduling signaling of corresponding downlink data.

In particular, according to one aspect of the present invention, said channel quality comprises at least one of { a first parameter, a second parameter }, the first parameter being a linear average of received power on all RS ports in the respective subset of identified signals, the second parameter being a quotient of the first parameter divided by a third parameter, the third parameter being a linear average of received power over a plurality of wideband symbols of the respective cell.

The first parameter and the second parameter correspond to RSRP (Reference Signal Receiving Power) and RSRQ (Reference Signal Receiving Quality), respectively.

As an embodiment, the plurality of wideband symbols are selected by the UE itself.

As an embodiment, the wideband symbol is an OFDM symbol within a system bandwidth of a corresponding cell.

As one embodiment, the wideband symbols are SC-FDMA symbols within the system bandwidth of the corresponding cell.

As one embodiment, the wideband symbol is an F-OFDM symbol within the system bandwidth of the corresponding cell.

As an embodiment, the identification signals in the identification signal group are transmitted by different one or more antenna ports, and the antenna ports are formed by a plurality of physical antennas through an antenna virtualization technology.

The invention discloses a method in a base station supporting multi-cell connection, which comprises the following steps:

-step A0. transmitting R sets of identification signals, said R sets of identification signals being transmitted by said R cells respectively

Step A, R downlink signals are respectively sent on R time frequency resources.

One identification signal group comprises a positive integer number of identification signals, one-time transmission of the identification signals occupies a positive integer number of time windows, the identification signals comprise one or more of { Zadoff-Chu sequence, pseudo-random sequence, RS resources and broadcast information }, the broadcast information comprises indexes of the identification signals, and the RS resources comprise a positive integer number of RS ports. The downlink signal includes at least one of { downlink data, downlink control signaling }, and the R downlink signals are respectively transmitted by R cells. And if the R is larger than 1, the frequency bands of the R cells which can be used for downlink transmission are completely or partially overlapped, and the R cells are maintained by the base station.

As an embodiment, any two of the R time-frequency resources are orthogonal.

As an embodiment, R is 1.

As an embodiment, R is 3.

-a step a4. Receiving backhaul information indicating at least the former of { R time-frequency resources, R identification signals }, said R being a positive integer.

Wherein the R identification signals belong to the R identification signal groups, respectively.

In an embodiment, in the above aspect, the R cells maintained by the base station do not include a primary serving cell of a target recipient of the R downlink signals.

As an example, the intended recipient of a given signal in the present invention means at least one of:

the timing of transmission of a given signal is determined based on the synchronization timing of the intended recipient

The generation parameters of the scrambling sequence employed by a given signal include the identity of the target recipient

Generation parameters for OCC (Orthogonal cover Code) sequences employed for a given signal include the identification of the intended recipient

The generation parameters of the RS sequence of the DMRS (Demodulation Reference Signal) employed for a given Signal include the identity of the target recipient.

As an embodiment, the downlink frequency bands of the R cells completely coincide.

As an embodiment, the cells corresponding to the positive integer number of time-frequency resources are maintained by one base station, and the target receiver of the backhaul information is a maintaining base station of the cell corresponding to the time-frequency resource indicated by the backhaul information.

As an embodiment, the backtransmission information comprises an index of a positive integer number of identification signals, each index identifying one identification signal.

As an embodiment, the backhaul information is transmitted through an X2 interface.

As an embodiment, the backhaul information is transmitted through an S1 interface.

As one embodiment, the backhaul information is transmitted over a directly connected optical fiber.

Specifically, according to one aspect of the present invention, the step a further includes the steps of:

-step A1. Sending L downlink messages, said L downlink messages indicating L time-frequency resources respectively and said L downlink messages being sent by a first cell

Step A5, sending Q pieces of backhaul information.

The L time-frequency resources may be used to transmit L downlink signals, where the L downlink signals are sent by L cells, all or part of frequency bands of the L cells that may be used for downlink transmission overlap, and L is a positive integer greater than 1. The R time frequency resources are R of the L time frequency resources, the R downlink signals are R of the L downlink signals, and the R cells are R of the L cells. The return information indicates at least the former one of { positive integer number of time frequency resources, positive integer number of identification signals }, and the Q pieces of return information indicate L-R number of time frequency resources in total. The L time frequency resources consist of the R time frequency resources and the L-R time frequency resources. And the cells corresponding to the positive integer time frequency resources are respectively the sending cells of the positive integer identification signals.

In an embodiment, in the above aspect, the R cells maintained by the base station include a first cell.

As an embodiment, the first cell is a primary serving cell of the target recipients of the L downlink information.

As an embodiment, the first cell is one of the L cells.

As an embodiment, the first cell is a cell other than the L cells.

As an embodiment, the L pieces of downlink information are indicated by higher layer signaling.

a step A3. Receiving L-1 uplink information.

Wherein the L-1 uplink information respectively indicates L-1 cells excluding a first cell from the L cells, the first cell is a main serving cell of a sender of the L-1 uplink information, the uplink information includes at least the former of { cell index, index of target identification signal }, and the target identification signal is one of the identification signal groups sent by the corresponding cell.

As an embodiment, the target recipients of the L uplink information are the first cells.

In particular, according to one aspect of the invention, an identification signal subset is used for determining a channel quality, said identification signal subset being a subset of said identification signal set, respectively, said identification signal subset comprising a positive integer number of identification signals. The channel quality includes at least one of { a first parameter, a second parameter }, the first parameter being a linear average of received power over all RS ports in the respective subset of identified signals, the second parameter being a quotient of the first parameter divided by a third parameter, the third parameter being a linear average of received power over a plurality of wideband symbols of the respective cell.

The invention discloses a user equipment supporting multi-cell connection, which comprises the following modules:

a first module: the system is used for receiving K identification signal groups which are respectively sent by K cells.

A second module: the system is used for receiving L downlink signals on L time frequency resources respectively, and the L downlink signals are sent by L cells respectively.

The frequency bands of the L cells that can be used for downlink transmission are wholly or partially overlapped, the downlink signal includes at least one of { downlink data and downlink control signaling }, and L is a positive integer greater than 1. L identification signal groups in the K identification signal groups are respectively sent by the L cells, one identification signal group comprises a positive integer number of identification signals, one-time sending of the identification signals occupies a positive integer number of time windows, the identification signals comprise one or more of { Zadoff-Chu sequence, pseudo-random sequence, RS resource and broadcast information }, the broadcast information comprises the index of the identification signals, and the RS resource comprises a positive integer number of RS ports.

As an embodiment, the above user equipment is characterized in that the first module is further configured to at least one of:

receiving L downlink messages, wherein the L downlink messages respectively indicate L time-frequency resources

Sending L-1 uplink messages.

As an embodiment, the user equipment is characterized in that the first module is further configured to determine K channel qualities according to the K subsets of identification signals, respectively. Wherein the K identification signal subgroups are subsets of the K identification signal groups, respectively, the identification signal subgroups include a positive integer number of identification signals, and the L channel qualities corresponding to the L cells are the highest L of the K channel qualities.

The invention discloses a base station device supporting multi-cell connection, which comprises the following modules:

a first module: for transmitting R identification signal groups respectively transmitted by the R cells

A second module: and is used for respectively sending R downlink signals on R time frequency resources.

One identification signal group comprises a positive integer number of identification signals, one-time transmission of the identification signals occupies a positive integer number of time windows, the identification signals comprise one or more of { Zadoff-Chu sequence, pseudo-random sequence, RS resources and broadcast information }, the broadcast information comprises indexes of the identification signals, and the RS resources comprise a positive integer number of RS ports. The downlink signals comprise at least one of { downlink data and downlink control signaling }, and the R downlink signals are respectively sent by the R cells. And if the R is larger than 1, the frequency bands of the R cells which can be used for downlink transmission are completely or partially overlapped, and the R cells are maintained by the base station.

As an embodiment, the base station device is characterized in that the first module is further configured to receive backhaul information, where the backhaul information indicates at least the former of { R time-frequency resources, R identification signals }, and where R is a positive integer. Wherein the R identification signals belong to the R identification signal groups, respectively.

As an embodiment, the base station device is characterized in that the first module is further configured to at least one of:

sending L downlink messages, said L downlink messages indicating L time-frequency resources respectively and said L downlink messages being sent by the first cell

Sending Q returned messages

Receive L-1 uplink messages.

The L time-frequency resources may be used to transmit L downlink signals, where the L downlink signals are sent by L cells, all or part of frequency bands of the L cells that may be used for downlink transmission overlap, and L is a positive integer greater than 1. The R time frequency resources are R of the L time frequency resources, the R downlink signals are R of the L downlink signals, and the R cells are R of the L cells. The return information indicates at least the former one of { positive integer number of time frequency resources, positive integer number of identification signals }, and the Q pieces of return information indicate L-R number of time frequency resources in total. The L time frequency resources consist of the R time frequency resources and the L-R time frequency resources. And the cells corresponding to the positive integer number of time-frequency resources are respectively the sending cells of the positive integer number of identification signals. The L-1 uplink information respectively indicates L-1 cells except a first cell in the L cells, the first cell is a main service cell of a sender of the L-1 uplink information, the uplink information comprises at least the former of { cell index, index of target identification signal }, and the target identification signal is one of identification signal groups sent by the corresponding cell.

Compared with the traditional scheme, the invention has the following advantages:

avoiding coverage problems with broadcast signals transmitted by multi-antenna base stations

Mitigation of inter-cell interference

Equalizing traffic between cells and improving transmission efficiency of the whole network

The time-frequency resource occupied by the downlink data can be configured by the high-level signaling, thereby reducing the signaling overhead of the physical layer and improving the transmission efficiency.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments thereof, made with reference to the following drawings:

FIG. 1 illustrates a flow diagram for a UE maintaining connectivity with multiple cells in accordance with one embodiment of the present invention;

fig. 2 is a schematic diagram illustrating time resources and frequency resources occupied by an identification signal according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating time and frequency resources occupied by two identification signals according to an embodiment of the present invention;

fig. 4 shows a flow diagram of a UE selecting a serving cell based on an identifying signal subgroup according to an embodiment of the invention;

fig. 5 shows a schematic diagram of frequency bands occupied by L time-frequency resources according to an embodiment of the invention;

fig. 6 shows a flow chart of a first cell transmitting configuration information of neighboring cells according to one embodiment of the present invention;

fig. 7 shows a schematic diagram of REs occupied by one RS port within one PRB pair according to an embodiment of the present invention;

fig. 8 shows a schematic diagram of REs occupied by multiple RS ports within one PRB pair according to an embodiment of the present invention;

FIG. 9 shows a schematic diagram of an identification signal and corresponding beam according to one embodiment of the invention;

fig. 10 shows a block diagram of a processing device used in a UE according to an embodiment of the present invention;

fig. 11 shows a block diagram of a processing device for use in a base station according to an embodiment of the invention;

Detailed Description

The technical solutions of the present invention will be further described in detail with reference to the accompanying drawings, and it should be noted that the features of the embodiments and examples of the present application may be arbitrarily combined with each other without conflict.

Example 1

Embodiment 1 illustrates a flowchart for keeping a UE connected to multiple cells, as shown in fig. 1. In fig. 1, N1 cell is the primary serving cell for UE U4. The N1 cell, the N2 cell and the N3 cell are respectively maintained by 3 base stations. In fig. 1, the steps in block F1, block F2, block F3 and block F4 are optional steps, respectively.

For N1, a first identification signal group is transmitted in step S11, first uplink information is received in step S12, first backhaul information is transmitted in step S13, 2 downlink information are transmitted in step S14, a first downlink signal is transmitted on a first time-frequency resource in step S15, and a first HARQ _ ACK is received in step S16.

For N2, a second identification signal group is sent in step S21, the first backhaul information is received in step S22, a second downlink signal is sent on a second time-frequency resource in step S23, and a second HARQ _ ACK is received in step S24.

For N3, a third set of identification signals is sent in step S31.

For U4, 3 sets of identification signals are received in step S41- { first set of identification signals, second set of identification signals, third set of identification signals }, first uplink information is transmitted in step S42, 2 downlink information is received in step S43, first downlink signal and second downlink signal are received in step S44, and first HARQ _ ACK and second HARQ _ ACK are transmitted in step S45.

In embodiment 1, one of the identification signal groups includes a positive integer of identification signals, one transmission of the identification signals occupies a positive integer of time windows, the identification signals include one or more of { Zadoff-Chu sequence, pseudorandom sequence, RS resource, and broadcast information }, the broadcast information includes an index of the identification signals, and the RS resource includes a positive integer of RS ports. The downlink signal includes at least one of { downlink data, downlink control signaling }. The frequency bands of { N1, N2, N3} which can be used for downlink transmission overlap in whole or in part. The first HARQ _ ACK indicates whether the downlink data in the first wireless signal is correctly decoded, and the second HARQ _ ACK indicates whether the downlink data in the second wireless signal is correctly decoded. The 2 pieces of downlink information respectively indicate a first time-frequency resource and a second time-frequency resource. The first uplink information indicates at least the former of { cell index of N2 cell, index of target identification signal }. The first feedback information includes at least the former of { indication information of the second time-frequency resource, index of the target identification signal }. The target identification signal is one identification signal of the second identification signal group.

As sub-embodiment 1 of embodiment 1, N1 is the primary serving cell of U4, and N2 and N3 are not the primary serving cells of U4.

As sub-embodiment 2 of embodiment 1, the identification signal includes at least RS resource among { Zadoff-Chu sequence, pseudo-random sequence, RS resource, broadcast information }.

As sub-embodiment 3 of embodiment 1, the downlink signal includes { downlink data, a downlink control signaling }, where the downlink control signaling is a scheduling signaling of the downlink data, and the downlink signaling includes scheduling information outside a time-frequency resource occupied by the corresponding downlink data. The scheduling information includes at least one of { MCS (Modulation and Coding Status ), RV (Redundancy Version number), NDI (New Data Indicator) }.

As sub-embodiment 4 of embodiment 1, U4 determines 3 channel qualities- { first channel quality, second channel quality, third channel quality }, respectively, based on { first identification signal subgroup, second identification signal subgroup, third identification signal subgroup } in step S41, where the third channel quality is the worst or only the third channel quality is below a certain criterion. Wherein { the first identification signal subgroup, the second identification signal subgroup, and the third identification signal subgroup } are subsets of { the first identification signal group, the second identification signal group, and the third identification signal group } respectively. The subset of identification signals comprises a positive integer number of identification signals.

As sub-embodiment 5 of embodiment 1, the above-mentioned channel quality includes at least one of { a first parameter, a second parameter }, the first parameter being a linear average (in watts) of received power on all RS ports in the corresponding identification signal sub-group, the second parameter being a quotient of the first parameter divided by a third parameter, the third parameter being a linear average (in watts) of received power over a plurality of wideband symbols.

As a sub-embodiment 6 of embodiment 1, the above specific standard is S criterion in LTE, where RSRP and RSRQ are replaced by the above first parameter and second parameter, respectively.

Example 2

Embodiment 2 illustrates a schematic diagram of time resources and frequency resources occupied by an identification signal, as shown in fig. 2. In fig. 2, a square marked by oblique lines is a time-frequency block occupied by one transmission of an identification signal.

In embodiment 2, the identification signal is transmitted periodically with a transmission period of T (unit is millisecond), which is a positive rational number.

As sub-embodiment 1 of embodiment 2, each identification signal of the identification signal group in the present invention occurs within one transmission cycle and only once.

As a sub-embodiment 2 of embodiment 2, one transmission of the identification signal occupies W time windows in the time domain, W being a positive integer greater than 1.

As a sub-embodiment 3 of embodiment 2, one transmission of the identification signal occupies a part of resource units in a time frequency block identified by oblique lines in fig. 2, the resource units including one carrier in the frequency domain and one wideband symbol in the time domain.

As sub-embodiment 4 of embodiment 2, the identification signal includes { a feature sequence, an RS resource, and broadcast information }, where the feature sequence includes at least one of a { Zadoff-Chu sequence, and a pseudo-random sequence }, a frequency band occupied by the feature sequence is a part of a system bandwidth, the broadcast information includes at least one of a { a system frame number, an index of the identification signal }, the RS resource includes a positive integer number of RS ports, and resource units occupied by the RS ports are distributed in all time-frequency sub-blocks within the system bandwidth. The time-frequency sub-blocks comprise a plurality of sub-carriers in the frequency domain, and the time-frequency block identified by the slashes in fig. 2 is composed of a positive integer of time-frequency sub-blocks in the frequency domain.

As a sub-embodiment 4 of embodiment 2, one transmission of an identification signal occupies W time windows in the time domain, where W is a positive integer greater than 1. In the W time windows, the characteristic sequence only appears in one time window, and each RS port in the RS resource appears in each time window.

Example 3

Embodiment 3 illustrates a schematic diagram of time resources and frequency resources occupied by two identification signals, as shown in fig. 3. In fig. 3, a square marked by oblique lines is a time frequency block occupied by one-time transmission of an identification signal, i.e., an identification signal I, and a square marked by reverse oblique lines is a time frequency block occupied by one-time transmission of an identification signal, i.e., an identification signal II.

In embodiment 3, the identification signal I and the identification signal II occupy different time window(s), respectively.

As sub-embodiment 1 of embodiment 3, an identification signal is transmitted a single time (i.e., non-periodically).

Example 4

Embodiment 4 illustrates a flow chart of the UE selecting a serving cell according to the identification signal subgroup, as shown in fig. 4. In fig. 4, none of the cells N5, N6, N7 are the primary serving cell for UE U8.

The cells N5, N6, N7 transmit the fifth, sixth and seventh identification signal groups in steps S51, S61, S71, respectively.

UE U8 receives the fifth, sixth and seventh identification signal groups in step S81; in step S82, a fifth channel quality, a sixth channel quality and a seventh channel quality are determined according to the fifth identification signal subgroup, the sixth identification signal subgroup and the seventh identification signal subgroup, respectively; in step S83, a suitable cell is selected from N5, N6, and N7 as a serving cell according to the fifth channel quality, the sixth channel quality, and the seventh channel quality.

In embodiment 4, the fifth identification signal subgroup, the sixth identification signal subgroup and the seventh identification signal subgroup are subsets of the fifth identification signal group, the sixth identification signal group and the seventh identification signal group, respectively.

As sub-embodiment 1 of embodiment 4, the fifth identification signal sub-group, the sixth identification signal sub-group and the seventh identification signal sub-group are respectively composed of one identification signal with the best reception quality among the fifth identification signal group, the sixth identification signal group and the seventh identification signal group.

As sub embodiment 2 of embodiment 4, the fifth identification signal sub group, the sixth identification signal sub group and the seventh identification signal sub group are the fifth identification signal group, the sixth identification signal group and the seventh identification signal group, respectively.

As sub-embodiment 3 of embodiment 4, the channel quality includes at least one of { a first parameter, a second parameter }, the first parameter being a linear average of received power over all RS ports in the corresponding subset of identification signals, the second parameter being a quotient of the first parameter divided by a third parameter, the third parameter being a linear average of received power over a plurality of wideband symbols of the corresponding cell.

Namely, the first parameter is:

wherein,

for the UE to receive signals on the mth resource unit occupied by the RS resource in the pth identification signal in the identification signal subgroup, P and M are the number of identification signals in the identification signal subgroup and the number of resource units in the RS resource, respectively.

The third parameter is:

wherein,

for the received signal on the G-th subcarrier in the C-th wideband symbol in the system bandwidth of the UE, C and G are the number of wideband symbols selected by the UE for determining the third parameter and the number of subcarriers in the system bandwidth, respectively.

Example 5

Embodiment 5 illustrates a schematic diagram of frequency bands occupied by L time-frequency resources in the present invention, as shown in fig. 5.

In embodiment 5, the frequency bands corresponding to the L time frequency resources in the present invention are the frequency bands corresponding to the time frequency resources { #1, #2, …, # L } in fig. 5. That is, the frequency bands corresponding to more than L time-frequency resources do not cover each other.

As a sub-embodiment of embodiment 5, the L time-frequency resources in the present invention are frequency bands in a system bandwidth.

Example 6

Embodiment 6 illustrates a flowchart of a first cell transmitting configuration information of neighboring cells, as shown in fig. 6. In embodiment 6, the first cell is the primary serving cell for UE U9.

The first cell transmits the higher layer signaling in step S101, and the UE U9 receives the higher layer signaling in step S901.

Wherein the high layer signaling includes configuration information of K cells, and the configuration information includes at least one of:

identification of a cell

Identification signal transmission period

Identifying the number of time windows occupied by a transmission of a signal

The number of identification signals included in the set of identification signals.

As sub-embodiment 1 of embodiment 6, the higher layer signaling is RRC (Radio Resource Control) signaling.

Example 7

Embodiment 7 illustrates a schematic diagram of an RE occupied by one RS port in one PRB pair in the present invention, as shown in fig. 7.

In embodiment 7, the time window in the present invention is an LTE subframe, and the resource unit in the present invention is an RE. In the invention, the RE occupied by one RS port in one PRB pair is the RE occupied by one CSI-RS port.

The small squares marked by slashes in fig. 7 correspond to REs occupied by one RS port in one PRB pair in the present invention.

As sub-embodiment 1 of embodiment 7, any two identification signals in one identification signal group in the present invention do not appear in the same LTE subframe.

Example 8

Embodiment 8 illustrates a schematic diagram of REs occupied by multiple RS ports within one PRB pair, as shown in fig. 8.

In embodiment 8, the time window in the present invention is an LTE subframe, and the resource unit in the present invention is an RE. In the invention, the RE occupied by one RS port in one PRB pair is the RE occupied by one CSI-RS port.

The small square marked by the number x in fig. 8 is an RE occupied by RS port # x in one PRB pair, where two RS ports share 2 REs by means of OCC (Orthogonal cover Code), and x is {0,1,2,3,4,5,6,7}.

As sub-embodiment 1 of embodiment 8, at least two identification signals in one identification signal group in the present invention appear in the same LTE subframe.

As sub-embodiment 2 of embodiment 8, all identification signals in one identification signal group in the present invention appear in the same LTE subframe.

Example 9

Example 9 illustrates a schematic diagram of an identification signal and corresponding beam, as shown in fig. 9.

In embodiment 9, one identification signal group in the present invention includes 4 identification signals, and the beams corresponding to the transmitting antenna ports of the 4 identification signals are respectively shown in (a), (b), (c), and (d) in fig. 9.

In embodiment 9, the 4 identification signals can make up the blind area formed by a single identification signal — the UE in the virtual coverage area as shown in (e) can find the existence of a cell by detecting the 4 identification signals.

As sub-embodiment 1 of embodiment 9, an identification signal is transmitted from one antenna port-corresponding to one RS port. An advantage of this sub-embodiment is that the overhead occupied by the RS port is saved.

As sub-embodiment 2 of embodiment 9, one identification signal is transmitted by a plurality of antenna ports-corresponding to a plurality of RS ports. The advantage of this sub-embodiment is that the directionality of the antenna port is better and the acceptance robustness is stronger.

Example 10

Embodiment 10 is a block diagram of a processing apparatus used in a UE, as shown in fig. 10. In fig. 10, the UE apparatus 200 is composed of a first module 201 and a second module 202.

The first module 201 is configured to receive K identification signal groups, where the K identification signal groups are respectively sent by K cells. The second module 202 is configured to receive L downlink signals on L time-frequency resources, where the L downlink signals are sent by L cells, respectively.

In embodiment 10, system bandwidths of the L cells that can be used for downlink transmission are overlapped, the downlink signal includes at least one of { downlink data, downlink control signaling }, and L is a positive integer greater than 1. L identification signal group in K identification signal group respectively by L district sends, one including the positive integer identification signal in the identification signal group, one sending of identification signal occupies positive integer time window, the identification signal includes the RS resource, broadcast information includes the index of identification signal, the RS resource includes positive integer RS port.

As sub-embodiment 1 of embodiment 10, the first module 201 is further configured to receive L pieces of downlink information, where the L pieces of downlink information respectively indicate L time-frequency resources.

As sub-embodiment 2 of embodiment 10, the first module 201 is further configured to send L-1 pieces of uplink information. Wherein the L-1 uplink messages respectively indicate L-1 cells excluding a first cell from the L cells, and the uplink message of the first cell is a main serving cell of the UE and includes a cell index.

As sub-embodiment 3 of embodiment 10, the second module 202 is further configured to send L HARQ _ ACKs, where the L HARQ _ ACKs are respectively used to indicate whether downlink data in the L downlink signals is decoded correctly. Target recipients of the L HARQ _ ACKs are the L cells, respectively.

Example 11

Embodiment 11 is a block diagram of a processing apparatus used in a base station, as shown in fig. 11. In fig. 11, a base station apparatus 300 is composed of a first module 301 and a second module 302.

The first module 301 is configured to send R identification signal groups, where the R identification signal groups are sent by the R cells respectively. The second module 302 is configured to send R downlink signals on R time-frequency resources, respectively.

In embodiment 11, one of the sets of identification signals includes a positive integer of identification signals, one transmission of the identification signals occupies a positive integer of time windows, the identification signals include at least RS resources of { Zadoff-Chu sequence, pseudorandom sequence, RS resources, and broadcast information }, the broadcast information includes an index of the identification signals, and the RS resources include a positive integer of RS ports. The downlink signal includes at least one of { downlink data, downlink control signaling }, and the R downlink signals are respectively transmitted by R cells. And if the R is larger than 1, the system bandwidths of the R cells which can be used for downlink transmission are overlapped, and the R cells are maintained by the base station.

As sub-embodiment 1 of embodiment 11, the first module 301 is further configured to receive backhaul information, where the backhaul information indicates at least the former of { R time-frequency resources, R identification signals }, and the R is a positive integer. Wherein the R identification signals belong to the R identification signal groups, respectively.

As sub-embodiment 2 of embodiment 11, the first module 301 is further configured to:

sending L downlink messages, wherein the L downlink messages respectively indicate L time-frequency resources and are sent by a first cell

Sending Q pieces of backtransmission information

Receive L-1 uplink messages.

The L time-frequency resources can be used to transmit L downlink signals, the L downlink signals are sent by L cells, frequency bands of the L cells that can be used for downlink transmission are overlapped, and L is a positive integer greater than 1. The R time frequency resources are R of the L time frequency resources, the R downlink signals are R of the L downlink signals, and the R cells are R of the L cells. Return information # q indicates { y ^q Individual time-frequency resource, y ^q At least the former of the two identification signals, for Q =1,2 ^q Is a positive integer. The Q pieces of return information indicate L-R pieces of time in totalThe frequency resources are:

the L time frequency resources consist of the R time frequency resources and the L-R time frequency resources. Y is ^q Y corresponding to each time frequency resource ^q The cells are respectively y ^q Identifying the transmitting cell of the signal. The L-1 uplink information respectively indicates L-1 cells except a first cell in the L cells, the first cell is a main service cell of a sender of the L-1 uplink information, the uplink information comprises at least the former of { cell index, index of target identification signal }, and the target identification signal is one of identification signal groups sent by the corresponding cell.

As sub-embodiment 3 of embodiment 11, the second module 302 is further configured to receive R HARQ _ ACKs, where the R HARQ _ ACKs respectively indicate whether downlink data in the R downlink signals is decoded correctly.

As sub-example 4 of example 11, the R is 1.

As sub-example 5 of example 11, the R is 2.

As sub-embodiment 5 of embodiment 11, the L time-frequency resources are pairwise orthogonal.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, such as a read-only memory, a hard disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may be implemented by using one or more integrated circuits. Accordingly, the module units in the above embodiments may be implemented in a hardware form, or may be implemented in a form of software functional modules, and the present application is not limited to any specific form of combination of software and hardware. The UE in the present invention includes but is not limited to a mobile phone, a tablet computer, a notebook, a network card, and other wireless communication devices. The base station or system device in the present invention includes but is not limited to a macro cell base station, a micro cell base station, a home base station, a relay base station, and other wireless communication devices.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method in a UE supporting multi-cell connectivity, comprising the steps of:

receiving K identification signal groups, wherein the K identification signal groups are respectively sent by K cells;

receiving L downlink signals on L time frequency resources respectively, wherein the L downlink signals are sent by L cells respectively;

the frequency bands of the L cells which can be used for downlink transmission are wholly or partially overlapped, the downlink signal comprises at least one of downlink data and downlink control signaling, and L is a positive integer greater than 1; l identification signal groups in the K identification signal groups are respectively transmitted by the L cells, one identification signal group comprises a positive integer of identification signals, one transmission of the identification signals occupies a positive integer of time window, the identification signals comprise broadcast information, the broadcast information comprises indexes of the identification signals, and the UE only receives paging information from a first cell in the L cells; the number of identification signals included in at least one identification signal group in the K identification signal groups is more than 1, and the identification signals are periodically transmitted; any two identification signals in the identification signal group are transmitted in different time windows; the UE is in an RRC connected state; the downlink control signaling is physical layer signaling, and the downlink control signaling is scheduling signaling of corresponding downlink data.

2. The method of claim 1, wherein the plurality of identification signals transmitted by one cell cover different areas by means of antenna virtualization.

3. The method of claim 1, comprising:

receiving L downlink information, wherein the L downlink information respectively indicates L time frequency resources;

wherein the L pieces of downlink information are sent by a first cell, and the first cell is a main serving cell of the UE.

4. A method according to any one of claims 1 to 3, comprising:

determining K channel qualities according to the K identification signal subgroups respectively;

wherein the K identification signal subgroups are subsets of the K identification signal groups, respectively, the identification signal subgroups comprising a positive integer number of identification signals; and the UE selects one or more serving cells according to the receiving quality, and the identification signal is a directionally-transmitted broadcast signal.

5. The method of claim 4, comprising:

sending L-1 uplink messages;

wherein the L-1 uplink messages respectively indicate L-1 cells excluding the first cell in the L cells; the uplink information indicates a cell index, or the uplink information indicates a cell index and an index of a target identification signal; the target identification signal is one of a set of identification signals transmitted by the respective cell.

6. The method of claim 5, wherein L is 2.

7. The method of claim 4, wherein the subset of identification signals includes only 1 identification signal, and wherein the identification signals in the set of identification signals share the RS sequence corresponding to the RS resource.

8. The method of claim 4, wherein at least one of the L cells is connected to the first cell via a non-ideal backhaul connection, or wherein at least one of the L cells is transmitted to the first cell via a direct connection optical fiber.

9. A method in a base station supporting multi-cell connections, comprising the steps of:

transmitting one set of identification signals, said one set of identification signals being transmitted by the first cell;

receiving backhaul information indicating at least the former of a time-frequency resource and an identification signal;

transmitting a downlink signal on a time-frequency resource;

the identification signal group comprises a positive integer number of identification signals, one transmission of the identification signals occupies a positive integer number of time windows, the identification signals comprise broadcast information, and the broadcast information comprises indexes of the identification signals; the downlink signal includes at least one of downlink data and downlink control signaling, and the downlink signal is sent by the first cell; the first cell is maintained by the base station; the identification signal is transmitted periodically; any two identification signals in the identification signal group are transmitted in different time windows; the receiver of the downlink signal is in an RRC connected state; a plurality of identification signals transmitted by a cell cover different areas by an antenna virtualization method; the downlink control signaling is physical layer signaling, and the downlink control signaling is scheduling signaling of corresponding downlink data.

10. The method of claim 9, comprising:

sending Q pieces of return information;

sending L pieces of downlink information, wherein the L pieces of downlink information respectively indicate L time-frequency resources and are sent by a first cell;

the L time-frequency resources can be used for transmitting L downlink signals respectively, the L downlink signals are sent by L cells respectively, all or part of frequency bands of the L cells which can be used for downlink transmission are overlapped, and L is a positive integer greater than 1; the one time-frequency resource is one of the L time-frequency resources, the one downlink signal is one of the L downlink signals, and the first cell is one of the L cells; the return information indicates at least the former of positive integer number of time frequency resources and positive integer number of identification signals, and the Q pieces of return information indicate L-1 time frequency resources in total; the L time frequency resources consist of the one time frequency resource and the L-1 time frequency resources; and the cells corresponding to the positive integer number of time-frequency resources are respectively the sending cells of the positive integer number of identification signals.

11. The method of claim 9, comprising:

receiving L-1 uplink information;

wherein, the L-1 uplink messages respectively indicate L-1 cells excluding a first cell from the L cells, the first cell is a main serving cell of a sender of the L-1 uplink messages, the uplink messages indicate a cell index, or the uplink messages indicate a cell index and an index of a target identification signal, and the target identification signal is one of identification signal groups sent by corresponding cells; paging information for the L-1 senders of uplink information is only on a first cell of the L cells; the sender of the L-1 upstream information is the receiver of the downstream signal.

12. The method according to any of claims 9 to 11, wherein the backhaul information is transmitted over a non-ideal backhaul interface or the backhaul information is transmitted over a directly connected optical fiber.

13. The method of claim 9, wherein the identification signal is a directionally-transmitted broadcast signal, and wherein the identification signals in the set of identification signals share an RS sequence corresponding to an RS resource.

14. A user equipment supporting multi-cell connection, comprising the following modules:

a first module: the system comprises a base station, a plurality of cells and a plurality of wireless communication terminals, wherein the base station is used for receiving K identification signal groups which are respectively sent by K cells;

a second module: the system comprises L cells, L time frequency resources and L downlink signals, wherein the L cells are used for transmitting the L downlink signals respectively;

the frequency bands of the L cells which can be used for downlink transmission are wholly or partially overlapped, the downlink signal comprises at least one of downlink data and downlink control signaling, and L is a positive integer greater than 1; l identification signal groups in the K identification signal groups are respectively transmitted by the L cells, one identification signal group comprises a positive integer of identification signals, one transmission of the identification signals occupies a positive integer of time window, the identification signals comprise broadcast information, the broadcast information comprises indexes of the identification signals, and the user equipment only receives paging information from a first cell in the L cells; the number of identification signals included in at least one identification signal group in the K identification signal groups is more than 1, and the identification signals are periodically transmitted; any two identification signals in the identification signal group are transmitted in different time windows; the receiver of the downlink signal is in an RRC connection state; the downlink control signaling is physical layer signaling, and the downlink control signaling is scheduling signaling of corresponding downlink data.

15. The UE of claim 14, wherein the plurality of identification signals transmitted by one cell cover different areas by antenna virtualization.

16. The user equipment of claim 15, comprising:

a first module: receiving L pieces of downlink information, wherein the L pieces of downlink information respectively indicate L time-frequency resources;

17. The user equipment according to any of claims 14 to 16, comprising:

a first module: determining K channel qualities according to the K identification signal subgroups respectively;

wherein the K identification signal subgroups are subsets of the K identification signal groups, respectively, the identification signal subgroups comprising a positive integer number of identification signals; and the user equipment selects one or more serving cells according to the receiving quality, and the identification signal is a directionally-transmitted broadcast signal.

18. The user equipment of claim 17, wherein the first module is further configured to:

sending L-1 uplink messages;

19. The UE of claim 17, wherein at least one of the L cells is in a non-ideal backhaul connection with the first cell, or wherein at least one of the L cells is in a direct-connect fiber-optic transmission with the first cell.

20. The UE of claim 17, wherein the subset of identification signals includes only 1 identification signal, and wherein the identification signals in the set of identification signals share the RS sequence corresponding to the RS resource.

21. A base station device supporting multi-cell connection comprises the following modules:

a first module: for transmitting one set of identification signals, said one set of identification signals being transmitted by the first cell; receiving backhaul information indicating at least the former of a time-frequency resource and an identification signal;

a second module: the system comprises a receiver and a transmitter, wherein the receiver is used for receiving a downlink signal on a time frequency resource;

wherein one of the identification signal groups comprises a positive integer of identification signals, one transmission of the identification signals occupies a positive integer of time windows, the identification signals comprise broadcast information, and the broadcast information comprises an index of the identification signals; the one downlink signal is transmitted by the first cell; the first cell is maintained by the base station; wherein the one identification signal belongs to the one identification signal group; the identification signal is transmitted periodically; any two identification signals in the identification signal group are transmitted in different time windows; the receiver of the downlink signal is in an RRC connected state; a plurality of identification signals transmitted by a cell cover different areas by an antenna virtualization method; the downlink control signaling is physical layer signaling, and the downlink control signaling is scheduling signaling of corresponding downlink data.

22. The base station device of claim 21, wherein the first module is further configured to at least one of:

sending L downlink information, where the L downlink information respectively indicates L time-frequency resources and is sent by a first cell;

sending Q returned messages;

receiving L-1 uplink messages;

the L time-frequency resources can be used for transmitting L downlink signals respectively, the L downlink signals are sent by L cells respectively, all or part of frequency bands of the L cells which can be used for downlink transmission are overlapped, and L is a positive integer greater than 1; the R time-frequency resources are R of the L time-frequency resources, the R downlink signals are R of the L downlink signals, and the R cells are R of the L cells; the return information indicates at least the former of positive integer number of time frequency resources and positive integer number of identification signals, and the Q pieces of return information indicate L-R time frequency resources in total; the L time frequency resources consist of the R time frequency resources and the L-R time frequency resources; the cells corresponding to the positive integer number of time frequency resources are respectively the sending cells of the positive integer number of identification signals; the L-1 uplink information respectively indicates L-1 cells except a first cell in the L cells, the first cell is a main service cell of a sender of the L-1 uplink information, the uplink information comprises at least the former of a cell index and an index of a target identification signal, and the target identification signal is one of identification signal sets sent by the corresponding cell.

23. The base station arrangement according to any of claims 21 to 22, wherein the backhaul information is transmitted over a non-ideal backhaul interface or the backhaul information is transmitted over a directly connected optical fiber.

24. The base station apparatus of claim 23, wherein:

the first module is used for receiving L-1 uplink messages;

25. The base station device of claim 23, wherein the identification signal is a directionally-transmitted broadcast signal, and wherein the identification signals in the identification signal group share an RS sequence corresponding to an RS resource.