CN109831813B - Cell search method and device in LAA communication - Google Patents
Cell search method and device in LAA communication Download PDFInfo
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- CN109831813B CN109831813B CN201910125594.1A CN201910125594A CN109831813B CN 109831813 B CN109831813 B CN 109831813B CN 201910125594 A CN201910125594 A CN 201910125594A CN 109831813 B CN109831813 B CN 109831813B
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Abstract
The invention provides a cell search method and a cell search device in LAA communication. In the first step, a base station sends a first signaling indication configuration parameter on a first carrier, wherein the configuration parameter is used for assisting in determining a first frequency domain resource; or determining the first frequency domain resource according to a predetermined criterion. In step two, the base station transmits the first sequence group on the first frequency domain resource in the first time window on the second carrier. The scheme of the invention ensures that the UE can detect the PCI conflict and report the PCI conflict to the service base station of the UE so as to avoid the inter-cell interference caused by the PCI conflict. The invention is compatible with the existing LTE protocol as much as possible and has better compatibility.
Description
The present application is a divisional application of the following original applications:
application date of the original application: 8 and 21 months in 2014
- -application number of the original application: 201410415572.6
The invention of the original application is named: cell search method and device in LAA communication
Technical Field
The present invention relates to a scheme for communication using an unlicensed spectrum in a wireless communication system, and in particular, to a cell search method and apparatus for LAA (Licensed Assisted Access) communication based on LTE (Long Term Evolution).
Background
In a conventional 3GPP (3rd Generation Partner Project) LTE system, data transmission can only occur on a licensed spectrum, however, with a drastic increase in traffic, especially in some urban areas, the licensed spectrum may be difficult to meet the traffic demand. A new research topic, namely unlicensed spectrum synthesis research (RP-132085), was discussed in 62 times of the 3GPP RAN (Radio Access Network ) conference, and the main purpose of the research is to research Non-independent (Non-stand alone) deployment using LTE over unlicensed spectrum, where the Non-independent means that communication over unlicensed spectrum is to be associated with serving cells over licensed spectrum. An intuitive method is to reuse the concept of Carrier Aggregation (CA) in the existing system as much as possible, that is, a serving cell deployed on a licensed spectrum is used as a PCC (Primary Component Carrier) and a serving cell deployed on an unlicensed spectrum is used as an SCC (Secondary Component Carrier). In RAN #64 congress (seminar), communication over unlicensed spectrum is uniformly named LAA (licensed Assisted Access).
In LAA communication, base station devices deployed by multiple operators may transmit wireless signals on the same frequency band, and then PCI (Physical Cell identifier) collisions may occur on a shared frequency band, that is, adjacent base stations configure the same PCI on the shared frequency band, and since the PCI is used for scrambling code of Physical layer data and generation of RS (Reference Signal) sequences, the PCI collisions may cause serious inter-Cell interference. In the LTE system, the PCI is indicated by a signature Sequence composed of PSS (Primary Synchronization Sequence) and SSS (Secondary Synchronization Sequence). If the PSS and the SSS transmitted by two serving cells (respectively controlled by two neighboring base stations) configured with the same PCI are kept synchronously transmitted, the UE (User Equipment) cannot even distinguish the two serving cells.
In order to solve the problems, the invention discloses a cell search method and a cell search device in LAA communication.
Disclosure of Invention
The invention discloses a method in a base station, which is characterized by comprising the following steps:
-step a. sending a first signaling indication configuration parameter on a first carrier, said configuration parameter being used to assist in determining a first frequency domain resource; or determining the first frequency domain resource according to a predetermined criterion
-step b. transmitting the first sequence group on the first frequency domain resource in the first time window on the second carrier.
The first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier. The first sequence group includes a signature sequence transmitted K times in the time domain, the signature sequence being distributed over F consecutive PRBs in the frequency domain, the signature sequence indicating a first PCI, the first PCI being one PCI used by the base station on a second carrier. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
The essence of the above method is that the signature sequence indicating the PCI is transmitted on the non-central frequency domain resource of the carrier, so that the neighboring base stations may transmit the signature sequence on different frequency domain resources, so that the UE can detect multiple PCIs even if the neighboring base stations are configured with the same PCI.
As an embodiment, in the first time window, the signature sequence is transmitted periodically, the transmission period is L subframes, and each transmission of the signature sequence occupies the same frequency band in the frequency domain. As an embodiment, the signature sequence includes 1 ZC (zadofffchu) sequence and 1 pseudo-random sequence, the ZC sequence and the pseudo-random sequence are transmitted in different OFDM (Orthogonal Frequency Division Multiplexing) symbols, the ZC sequence and the pseudo-random sequence occupy the same Frequency band, and the signature sequence is distributed on consecutive positive integer number of PRBs (Physical Resource blocks) in a Frequency domain. As an embodiment, the signature sequence includes 1 PSS and 1 SSS, and the first PCI is a non-negative integer less than 504. As an example, said F is 6. As an example, K is 1. As an embodiment, the first signaling is higher layer signaling. As an example, L is 5. As an example, L is 10. As an embodiment, the predetermined criterion is: a first frequency domain resource is determined from a center frequency of a first carrier. As an embodiment of the step a, the first frequency domain resource is determined by mapping a center frequency of the first carrier (i.e. the base station does not need to send the configuration parameters in the first carrier) — since a frequency point available for a carrier center frequency on the licensed spectrum is usually greater than the number of PRBs in the second carrier, a plurality of frequency points available for a carrier center frequency may be mapped to the same frequency domain resource.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
step C, receiving uplink signaling to determine that the first PCI is the same as the PCI used by the adjacent base station on the second carrier
-step d. sending a higher layer signaling indication to stop the first PCI based transmission on the second carrier.
The transmitting on the second carrier based on the first PCI is: and determining the scrambling code of the downlink physical layer data by using the first PCI, and generating a downlink RS sequence by using the first PCI.
As an embodiment of step D, the base station sends the first higher layer signaling on the first carrier to modify the PCI of the secondary cell corresponding to the second carrier to be the second PCI, and sends the sequence group mapped to the second PCI on the second carrier, where the second PCI is a PCI other than the first PCI. As a sub-embodiment of one embodiment of said step D, the first said higher layer signaling comprises the following IE (Information Element): scelltoddmodlist, radioresourceconfigcommonsescell, and radioresourceconfigdedicatedsell.
As another embodiment of step D, the base station sends a second higher layer signaling on the first carrier to release the secondary cell corresponding to the second carrier. As a sub-embodiment of said further embodiment of step D, the second higher layer signaling comprises scelltoereleaselist IE.
Specifically, according to an aspect of the present invention, the step B further includes the steps of:
-step b1. periodically transmitting the first sequence group on the second carrier with a transmission period of L × K consecutive subframes.
According to the above aspect, the first time window is one transmission cycle of the first sequence group.
In particular, according to one aspect of the present invention, the transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and the configuration parameter is used to assist in determining the transmission frequency band of the first sequence group on the second carrier.
As an embodiment, the first sequence group is frequency hopped over the frequency domain in different time windows.
As an embodiment, the configuration parameter indicates a frequency domain position of a feature sequence sent by the first sequence group in a Frame whose SFN (System Frame Number) corresponding to the first carrier is 0, and the frequency hopping uses a predetermined criterion — binding with a center frequency point of the first carrier.
As an embodiment, the configuration parameter indicates a frequency domain position of a signature sequence transmitted by the first sequence group in a Frame whose SFN (System Frame Number) corresponding to the first carrier is 0, and the configuration parameter further indicates a frequency hopping parameter.
Specifically, according to the above aspect of the present invention, it is characterized in that K is 4.
The above aspect ensures that the 4 consecutive signature sequences occupy the same frequency domain resource, which is beneficial to improving the robustness of the UE detecting the signature sequence (i.e. if two adjacent transmissions of the signature sequence hop in the frequency domain and the UE cannot determine the hopping criterion of the non-serving base station, the UE can only detect the signature sequence according to one transmission, which may cause false alarm or false alarm).
The invention discloses a method in UE, which is characterized by comprising the following steps:
-step a. receiving a first signaling on a first carrier to determine a configuration parameter, and determining a first frequency domain resource in an assisted manner according to the configuration parameter; or determining the first frequency domain resource according to a predetermined criterion
-step b. detecting a signature sequence in a first time window on a second carrier.
The first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier. The first sequence group comprises the signature sequence which is sent K times in the time domain, the signature sequence is distributed on the continuous F PRBs in the frequency domain, the signature sequence indicates a first PCI, and the first PCI is a PCI used by the sending base station of the first signaling on the second carrier wave. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
As an embodiment, the first signaling is higher layer signaling. As an embodiment, the signature sequence comprises PSS and SSS. As an example, said F is 6. As an example, K is 1. As an embodiment, the first signaling is higher layer signaling. As an example, L is 5. As an example, L is 10.
Specifically, according to one aspect of the present invention, the method further comprises the following steps:
step c. sending uplink signaling indicating that the first PCI is the same as the PCI used by the neighboring base station on the second carrier
-step d. receiving higher layer signaling determines to stop the first PCI based reception on the second carrier.
Wherein the UE detects the signature sequence on frequency domain resources outside the first frequency domain resources in a first time window on a second carrier.
As an embodiment of step D, the UE receives the first high-level signaling on the first carrier, determines that the PCI of the secondary cell corresponding to the second carrier is modified to a second PCI, and simultaneously receives the sequence group mapped to the second PCI on the second carrier, where the second PCI is a PCI other than the first PCI.
As another embodiment of step D, the UE receives a second higher layer signaling on the first carrier to determine that the secondary cell corresponding to the second carrier is released.
In particular, according to one aspect of the invention, the first frequency domain resource is associated with a time domain position of the first time window.
As an embodiment, the first sequence group is frequency hopped in different time windows.
Specifically, according to the above aspect of the present invention, it is characterized in that K is 4.
The invention discloses a base station device, which is characterized by comprising:
a first module: the first signaling indication configuration parameter is used for sending a first signaling indication configuration parameter on a first carrier, and the configuration parameter is used for assisting in determining a first frequency domain resource; or for determining the first frequency domain resource according to a predetermined criterion
A second module: for transmitting the first sequence group on the first frequency domain resources in the first time window on the second carrier.
The first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier. The first sequence group includes a signature sequence transmitted K times in the time domain, the signature sequence being distributed over F consecutive PRBs in the frequency domain, the signature sequence indicating a first PCI, the first PCI being one PCI used by the base station on a second carrier. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
As an embodiment, the above apparatus further comprises:
a third module: for receiving uplink signaling to determine that the first PCI is the same as the PCI used by the adjacent base station on the second carrier
A fourth module: for sending a higher layer signaling indication to stop the first PCI based transmission on the second carrier.
As an embodiment of the foregoing fourth module, the fourth module is configured to send a first higher layer signaling on the first carrier to modify a PCI of the secondary cell corresponding to the second carrier to a second PCI, and send a sequence group mapped to the second PCI on the second carrier, where the second PCI is a PCI other than the first PCI. As another embodiment of the foregoing fourth module, the fourth module is configured to send a second higher layer signaling on the first carrier to release the secondary cell corresponding to the second carrier.
The invention discloses a user equipment, which is characterized by comprising:
a first module: the device comprises a first carrier and a second carrier, wherein the first carrier is used for receiving a first signaling to determine a configuration parameter and determining a first frequency domain resource in an auxiliary manner according to the configuration parameter; or determining the first frequency domain resource according to a predetermined criterion
A second module: for detecting the signature sequence in a first time window on a second carrier.
The first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier. The first sequence group comprises the signature sequence which is sent K times in the time domain, the signature sequence is distributed on the continuous F PRBs in the frequency domain, the signature sequence indicates a first PCI, and the first PCI is a PCI used by the sending base station of the first signaling on the second carrier wave. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
As an embodiment, the above apparatus further comprises:
a third module: the method is used for sending uplink signaling to indicate that the first PCI is the same as the PCI used by the adjacent base station on the second carrier wave
A fourth module: for receiving higher layer signaling to determine to cease reception based on the first PCI on the second carrier.
Wherein the UE detects the signature sequence on frequency domain resources outside the first frequency domain resources in a first time window on a second carrier.
As an embodiment of the foregoing fourth module, the fourth module is configured to receive the first high-level signaling on the first carrier, determine that a PCI of the secondary cell corresponding to the second carrier is modified to a second PCI, and receive a sequence group mapped to the second PCI on the second carrier, where the second PCI is a PCI other than the first PCI. As another embodiment of the foregoing fourth module, the fourth module is configured to receive a second higher layer signaling on the first carrier to determine that the secondary cell corresponding to the second carrier is released.
Aiming at the problem of PCI conflict in LAA communication, the scheme of the invention enables a base station to transmit a characteristic sequence for indicating PCI at a non-carrier center frequency. As an embodiment, the signature sequences are frequency hopped in different transmission time windows. The scheme of the invention ensures that the UE can detect the PCI conflict and report the PCI conflict to the service base station of the UE so as to avoid the inter-cell interference caused by the PCI conflict. The invention is compatible with the existing LTE protocol as much as possible and has better compatibility.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 shows a flow diagram of a cell PCI search in accordance with one embodiment of the present invention;
FIG. 2 shows a schematic diagram of 1 transmission including a signature sequence in a sequence group according to one embodiment of the invention;
FIG. 3 illustrates a diagram of multiple transmissions including signature sequences in a sequence group according to one embodiment of the invention;
fig. 4 shows a block diagram of a processing means in a base station according to an embodiment of the invention;
fig. 5 shows a block diagram of a processing device in a UE 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 flow chart of cell PCI search, as shown in fig. 1. In fig. 1, base station N1 is the serving base station for UE U2, and base station N3 is the neighbor base station for base station N1.
For base station N1, in step S10, transmitting a first signaling indication configuration parameter on a first carrier, the configuration parameter being used to assist in determining a first frequency domain resource; in step S11, a first sequence group is transmitted on a first frequency domain resource in a first time window on a second carrier; in step S12, receiving the uplink signaling to determine that the first PCI is the same as the PCI used by the neighboring base station on the second carrier; in step S13, the transmission higher layer signaling indicates that the first PCI-based transmission on the second carrier is to be stopped.
For base station N3, in step S30, transmitting a third signaling indication configuration parameter on a third carrier, the configuration parameter being used to assist in determining a second frequency domain resource located on a second carrier; in step S31, the second sequence group is transmitted in the second frequency domain resource in the first time window.
For UE U2, in step S20, receiving a first signaling on a first carrier to determine a configuration parameter from which to assist in determining a first frequency domain resource; in step S21, the signature sequence is detected on a second frequency domain resource in a first time window on a second carrier; in step S22, sending an uplink signaling indication that the first PCI is the same as the PCI used by the neighboring base station on the second carrier; in step S23, the reception higher layer signaling determines to stop the reception based on the first PCI on the second carrier.
In embodiment 1, a first carrier is deployed in a licensed spectrum, a second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier. The first sequence group and the second sequence group respectively comprise the same signature sequence which is transmitted K times in the time domain, the signature sequence is distributed on the continuous F PRBs in the frequency domain, the signature sequence indicates a first PCI, and the first PCI is a PCI used by the base station N1 on the second carrier. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer. The transmission interval of the signature sequence is L subframes. The bandwidth of the secondary cell corresponding to the second sequence group controlled by the base station N3 completely coincides with or partially coincides with the bandwidth of the second carrier. The second frequency domain resource is a frequency domain resource on the second carrier that is not equal to the first frequency domain resource.
As sub-embodiment 1 of embodiment 1, said K is 1 and said L is 5 or 10.
As sub-embodiment 2 of embodiment 1, K is 4 and L is 5 or 10.
As sub-embodiment 3 of embodiment 1, the F is 6 and the signature sequence comprises one PSS and one SSS.
Example 2
Embodiment 2 illustrates a schematic diagram of 1 transmission including a signature sequence in a sequence group in the present invention, as shown in fig. 2. In fig. 2, oblique lines identify time-frequency resources occupied by the feature sequences.
In embodiment 2, one sequence group includes one transmission of the signature sequence, the base station periodically transmits the signature sequence on a fixed frequency domain resource, and the transmission period is 1 time window (i.e. the time length of the first time window in embodiment 1). The time window in example 1 corresponds to any one of the time windows in fig. 2.
Example 3
Embodiment 3 illustrates a schematic diagram of multiple transmissions including signature sequences in a sequence group in the present invention, as shown in fig. 3. In fig. 3, oblique lines identify time-frequency resources occupied by the feature sequences.
In embodiment 3, one sequence group includes a plurality of (4 in fig. 3 as an example) transmissions of the signature sequence within one time window, and the base station periodically transmits the signature sequence on fixed frequency domain resources for one time window. The resource occupied by the signature sequence is frequency hopped between different time windows. The time window in example 1 corresponds to any one of the time windows in fig. 3.
Example 4
Embodiment 4 illustrates a block diagram of a processing device in a base station, as shown in fig. 4. In fig. 4, the base station processing apparatus 300 is composed of a transmitting module 301, a transmitting module 302, a receiving module 303 and a transmitting module 304, wherein the receiving module 303 and the transmitting module 304 are optional modules.
The sending module 301 is configured to send a first signaling indication configuration parameter on a first carrier, where the configuration parameter is used to assist in determining a first frequency domain resource; or for determining the first frequency domain resources according to a predetermined criterion. The sending module 302 is configured to send the first sequence group on the first frequency-domain resource in the first time window on the second carrier. The receiving module 303 is configured to receive the uplink signaling to determine that the first PCI is the same as the PCI used by the neighboring base station on the second carrier. The sending module 304 is configured to send a higher layer signaling indication to stop sending based on the first PCI on the second carrier.
In embodiment 4, the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of the first sequence group in the first time window on the second carrier. The first sequence group includes a signature sequence transmitted K times in the time domain, the signature sequence being distributed over F consecutive PRBs in the frequency domain, the signature sequence indicating a first PCI, the first PCI being one PCI used by the base station on a second carrier. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
As sub-embodiment 1 of embodiment 4, the sending module 302 is further configured to send the first sequence group periodically on the second carrier, where the sending period is L × K consecutive subframes. The transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and the configuration parameter is used for assisting in determining the transmission frequency band of the first sequence group on the second carrier.
Example 5
Embodiment 5 illustrates a block diagram of a processing device in a UE, as shown in fig. 5. In fig. 5, the UE processing apparatus 400 is composed of a receiving module 401, a receiving module 402, a sending module 403 and a receiving module 404.
The receiving module 401 is configured to receive a first signaling on a first carrier to determine a configuration parameter, and determine a first frequency domain resource in an assisted manner according to the configuration parameter; or determining the first frequency domain resource according to a predetermined criterion. The receiving module 402 is configured to detect a signature sequence in a first time window on a second carrier.
In embodiment 5, the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of the first sequence group in the first time window on the second carrier. The first sequence group comprises the signature sequence which is sent K times in the time domain, the signature sequence is distributed on the continuous F PRBs in the frequency domain, the signature sequence indicates a first PCI, and the first PCI is a PCI used by the sending base station of the first signaling on the second carrier wave. The first frequency-domain resources comprise at least one PRB that is a PRB other than the F central PRBs on the second carrier, K being a positive integer and F being a positive integer. The first time window includes L x K consecutive subframes, L being a positive integer.
If the UE detects the signature sequence on frequency domain resources other than the first frequency domain resource in the first time window on the second carrier:
a sending module 403 is configured to send uplink signaling to indicate that the first PCI is the same as the PCI used by the neighboring base station on the second carrier
A receiving module 404 for receiving higher layer signaling to determine to stop the first PCI based reception on the second carrier.
As sub-embodiment 1 of embodiment 5, the first frequency domain resource is related to a time domain position of the first time window, and K is a positive integer greater than 1.
As sub-embodiment 2 of embodiment 5, the first frequency-domain resource is independent of the time-domain position of the first time window, and K is 1.
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 instructing relevant hardware through a program, 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 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 (32)
1. A base station apparatus, characterized in that the apparatus comprises:
a first module: the first signaling indication configuration parameter is used for sending a first signaling indication configuration parameter on a first carrier, and the configuration parameter is used for assisting in determining a first frequency domain resource; or for determining the first frequency domain resource according to a predetermined criterion;
a second module: means for transmitting a first sequence group on a first frequency domain resource in a first time window on a second carrier;
the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier; the first sequence group comprises a characteristic sequence which is sent K times in a time domain, the characteristic sequence is distributed on continuous F PRBs in a frequency domain, the PRBs are physical resource blocks, the characteristic sequence indicates a first PCI, the PCI is a physical cell identifier, and the first PCI is a PCI used by the base station on a second carrier; the first frequency-domain resource comprises at least one PRB that is a PRB other than F central PRBs on the second carrier, K being a positive integer, and F being a positive integer; the first time window comprises L x K consecutive subframes, L being a positive integer; the signature sequence comprises a PSS and an SSS, wherein the PSS is a primary synchronization sequence, and the SSS is a secondary synchronization sequence.
2. The apparatus of claim 1, further comprising:
a third module: the PCI used for receiving the uplink signaling and determining that the first PCI is the same as the PCI used by the adjacent base station on the second carrier wave;
a fourth module: for sending a higher layer signaling indication to stop the first PCI based transmission on the second carrier.
3. The apparatus of claim 1, wherein the first frequency-domain resource relates to a time-domain position of the first time window.
4. The apparatus of claim 1, wherein L is 5, and K is a positive integer greater than 1; alternatively, said L is 5 and said K is 1; alternatively, said L is 10 and said K is 1; alternatively, said L is 5; alternatively, said L is 10.
5. The apparatus of claim 1, wherein:
the second module periodically sends the first sequence group on a second carrier, and the sending period is L × K continuous subframes; the first time window is one transmission period of the first sequence group.
6. The apparatus of claim 1, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies a same frequency band in a frequency domain.
7. The apparatus of claim 5, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies the same frequency band in the frequency domain.
8. The apparatus according to any of claims 1-7, wherein the first signaling is higher layer signaling.
9. The apparatus of any of claims 1 to 7, wherein the transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and wherein the configuration parameter is used to assist in determining the transmission frequency band of the first sequence group on the second carrier.
10. A user equipment, characterized in that the equipment comprises:
a first module: the device comprises a first carrier and a second carrier, wherein the first carrier is used for receiving a first signaling to determine a configuration parameter and determining a first frequency domain resource in an auxiliary manner according to the configuration parameter; or determining the first frequency domain resource according to a predetermined criterion;
a second module: for detecting a signature sequence in a first time window on a second carrier;
the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier; the first sequence group comprises the characteristic sequence which is sent K times in the time domain, the characteristic sequence is distributed on continuous F PRBs in the frequency domain, the PRBs are physical resource blocks, the characteristic sequence indicates a first PCI, the PCI is a physical cell identifier, and the first PCI is a PCI used by a sending base station of a first signaling on a second carrier; the first frequency-domain resource comprises at least one PRB that is a PRB other than F central PRBs on the second carrier, K being a positive integer, and F being a positive integer; the first time window comprises L x K consecutive subframes, L being a positive integer; the signature sequence comprises a PSS and an SSS, wherein the PSS is a primary synchronization sequence, and the SSS is a secondary synchronization sequence.
11. The apparatus of claim 10, further comprising:
a third module: the PCI used for sending the uplink signaling to indicate that the first PCI is the same as the PCI used by the adjacent base station on the second carrier wave;
a fourth module: means for receiving higher layer signaling to determine to cease reception based on the first PCI on the second carrier;
wherein the user equipment detects the signature sequence on frequency domain resources outside the first frequency domain resources in a first time window on a second carrier.
12. The apparatus of claim 10, wherein the first frequency-domain resource relates to a time-domain position of the first time window.
13. The apparatus of claim 10, wherein L is 5, and K is a positive integer greater than 1; alternatively, said L is 5 and said K is 1; alternatively, said L is 10 and said K is 1; alternatively, said L is 5; alternatively, said L is 10.
14. The apparatus of claim 10, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies a same frequency band in a frequency domain.
15. The apparatus according to any of claims 10-14, characterised in that the first signalling is higher layer signalling.
16. The apparatus of any of claims 10 to 14, wherein the transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and wherein the configuration parameter is used to assist in determining the transmission frequency band of the first sequence group on the second carrier.
17. A method in a base station, comprising the steps of:
-step a. sending a first signaling indication configuration parameter on a first carrier, said configuration parameter being used to assist in determining a first frequency domain resource; or determining the first frequency domain resource according to a predetermined criterion;
-step b. transmitting a first sequence group on a first frequency domain resource in a first time window on a second carrier;
the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier; the first sequence group comprises a characteristic sequence which is sent K times in a time domain, the characteristic sequence is distributed on continuous F PRBs in a frequency domain, the PRBs are physical resource blocks, the characteristic sequence indicates a first PCI, the PCI is a physical cell identifier, and the first PCI is a PCI used by the base station on a second carrier; the first frequency-domain resources comprise at least one PRB that is a PRB other than F central PRBs on the second carrier, K is a positive integer, the F is a positive integer and the first time window comprises L × K consecutive subframes, and L is a positive integer; the signature sequence comprises a PSS and an SSS, wherein the PSS is a primary synchronization sequence, and the SSS is a secondary synchronization sequence.
18. The method of claim 17, further comprising the steps of:
step C, receiving uplink signaling to determine that the first PCI is the same as the PCI used by the adjacent base station on the second carrier;
-step d. sending a higher layer signaling indication to stop the first PCI based transmission on the second carrier.
19. The method of claim 17, wherein the first frequency-domain resource relates to a time-domain position of the first time window.
20. The method of claim 17, wherein L is 5, and K is a positive integer greater than 1; alternatively, said L is 5 and said K is 1; alternatively, said L is 10 and said K is 1; alternatively, said L is 5; alternatively, said L is 10.
21. The method of claim 17, wherein step B further comprises the steps of:
-step b1. periodically transmitting the first sequence group on the second carrier with a transmission period of L × K consecutive sub-frames; the first time window is one transmission period of the first sequence group.
22. The method of claim 17, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies a same frequency band in a frequency domain.
23. The method of claim 21, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies a same frequency band in a frequency domain.
24. The method according to any of claims 17 to 23, wherein said first signaling is higher layer signaling.
25. The method according to any of claims 17 to 23, wherein the transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and the configuration parameter is used to assist in determining the transmission frequency band of the first sequence group on the second carrier.
26. A method in a user equipment, comprising the steps of:
-step a. receiving a first signaling on a first carrier to determine a configuration parameter, and determining a first frequency domain resource in an assisted manner according to the configuration parameter; or determining the first frequency domain resource according to a predetermined criterion
-step b. detecting a signature sequence in a first time window on a second carrier;
the first carrier is deployed in a licensed spectrum, the second carrier is deployed in an unlicensed spectrum, and the first frequency domain resource is a transmission frequency band of a first sequence group in a first time window on the second carrier; the first sequence group comprises the characteristic sequence which is sent K times in the time domain, the characteristic sequence is distributed on continuous F PRBs in the frequency domain, the PRBs are physical resource blocks, the characteristic sequence indicates a first PCI, the PCI is a physical cell identifier, and the first PCI is a PCI used by a sending base station of a first signaling on a second carrier; the first frequency-domain resource comprises at least one PRB that is a PRB other than F central PRBs on the second carrier, K being a positive integer, and F being a positive integer; the first time window comprises L x K consecutive subframes, L being a positive integer; the signature sequence comprises a PSS and an SSS, wherein the PSS is a primary synchronization sequence, and the SSS is a secondary synchronization sequence.
27. The method of claim 26, further comprising the steps of:
step C, sending an uplink signaling to indicate that the first PCI is the same as the PCI used by the adjacent base station on the second carrier;
-step d. receiving higher layer signaling determines to stop the first PCI based reception on the second carrier.
28. The method of claim 26, wherein the first frequency-domain resource relates to a time-domain position of the first time window.
29. The method of claim 26, wherein L is 5, and K is a positive integer greater than 1; alternatively, said L is 5 and said K is 1; alternatively, said L is 10 and said K is 1; alternatively, said L is 5; alternatively, said L is 10.
30. The method of claim 26, wherein the signature sequence is transmitted periodically in a first time window, wherein the transmission period is L subframes, and wherein each transmission of the signature sequence occupies a same frequency band in a frequency domain.
31. The method according to any of the claims 26 to 30, characterised in that said first signalling is higher layer signalling.
32. The method according to any of the claims 26 to 30, wherein the transmission frequency band of the first sequence group on the second carrier is related to the time domain position of the time window of the first sequence group, and wherein the configuration parameter is used to assist in determining the transmission frequency band of the first sequence group on the second carrier.
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| US10271227B2 (en) * | 2016-06-13 | 2019-04-23 | Qualcomm Incorporated | Enhanced neighbor relations and physical cell identifier confusion detection |
| CN108123782B (en) * | 2016-11-27 | 2020-11-06 | 上海朗帛通信技术有限公司 | Method and device in wireless communication |
| CN110121179B (en) * | 2018-02-05 | 2022-01-04 | 维沃移动通信有限公司 | Small cell discovery method and device |
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| CN109831813A (en) | 2019-05-31 |
| CN105472702B (en) | 2019-03-15 |
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