CN104734762B - A kind of processing method, device and system finding signal - Google Patents
A kind of processing method, device and system finding signal Download PDFInfo
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- CN104734762B CN104734762B CN201310714915.4A CN201310714915A CN104734762B CN 104734762 B CN104734762 B CN 104734762B CN 201310714915 A CN201310714915 A CN 201310714915A CN 104734762 B CN104734762 B CN 104734762B
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- 238000012545 processing Methods 0.000 claims description 12
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a kind of processing method, device and system for finding signal, base station sends multiple discovery signals in section at the same time or different time sections；Wherein, multiple discovery signals having the same discovery signal sequence of multiple discovery signals in multiple discovery signal groups, identical discovery signal group, the discovery signal group is interior to include at least a discovery signal；Base station sends the discovery signal of multiple discovery signals or multiple discovery signal groups using multiple wave beams.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for processing a Discovery Signal (DS).
Background
In high-frequency communication, since a higher carrier frequency is used for transmission, the average path loss is much larger than that of a conventional Long Term Evolution (LTE) system, for example, a carrier frequency of 28GHz is used for transmission, and a formula is used for transmissionThe average proportion information of the high-frequency path loss value and the LTE path loss value can be calculated as follows:
in order to ensure coverage in high frequency communication, that is, to satisfy a minimum Signal to interference plus Noise Ratio (SINR) requirement on a receiving side, it is necessary to increase transmission and receiver gains, that is:
wherein, R is the radius covered by the cell, lambda is the wavelength of the corresponding carrier wave, GtFor transmitting antenna gain, GrIs a receiving dayAnd (4) line gain.
The LTE communication demand is highest and requires coverage of 100km, and if only the average path loss (open area) is considered according to the highest coverage area, the coverage area which can be supported by the highest high-frequency communication can reach 1 km. If the characteristics of high air absorption (oxygen absorption, rain fading and fog fading) and sensitivity to shadow fading and the like of the actual high-frequency carrier wave are considered, the coverage area which can be actually supported is less than 1 km.
If the high-frequency communication supports a coverage area of 1km at most, the SINR ratio which can be obtained in the same coverage area is different from that of an LTE system, the signal-to-noise ratio of the former coverage area is reduced by at least 20dB compared with that of the latter coverage area, and in order to ensure that the high-frequency communication has approximate SINR within the coverage area of the LTE system, the antenna gain of the high-frequency communication needs to be ensured. Fortunately, since the high-frequency communication has a shorter wavelength, it can be ensured that more antenna elements are accommodated in a unit area, and the more antenna elements can provide a higher antenna gain, thereby ensuring the coverage performance of the high-frequency communication.
More antenna elements means that beamforming methods can be used to ensure coverage for high frequency communications. As known from the previous design concept of LTE, to obtain a good beamforming effect, it is necessary to accurately obtain the state information of the channel, so as to obtain the beamforming weights from the state information of the channel. For a sending end (such as a base station), a receiving end (such as a terminal) needs to feed back downlink channel state information or weight; for the receiving end, the sending end needs to feed back the channel state information or weight of the uplink, thereby ensuring that the base station can send the downlink service by using the optimal beam, and the terminal can also send the uplink service by using the optimal beam. In this case, before the base station obtains the weight, the base station cannot cover the receiving end with the optimal beam, so that the receiving end cannot measure the reference signal sent by the base station to perform measurement, or even if the base station covers the terminal, the terminal cannot reach the same coverage of the base station, and the feedback content cannot be known by the base station, so that the selection of the beam weight and normal communication cannot be performed.
Disclosure of Invention
In view of this, the present invention provides a method, an apparatus, and a system for processing a discovery signal, which ensure reliable transmission between a base station and a terminal.
The technical scheme of the invention is realized as follows:
a method of discovery signal processing, the method comprising:
the base station transmits a plurality of discovery signals in the same time period or different time periods; wherein the plurality of discovery signals are from a plurality of discovery signal groups, the plurality of discovery signals within the same discovery signal group have the same discovery signal sequence, and the discovery signal group includes at least one discovery signal;
the base station transmits discovery signals of a plurality of discovery signals or a plurality of discovery signal groups using a plurality of beams.
The plurality of discovery signals or discovery signals within the plurality of discovery signal groups are transmitted in a plurality of resource units, the resource units comprising at least one of the following resources: time domain resources, frequency domain resources, space domain resources, power resources, discovery signal sequence resources.
The time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit is the minimum time unit for distributing time domain resources to the base station; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups are transmitted by adopting a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of discovery signal sequences.
The base station periodically transmits the discovery signal; the periodicity of transmission is configured and/or predefined by the system messages.
The base station transmits the discovery signal in full bandwidth, or the base station transmits the discovery signal in partial bandwidth.
And the frequency domain position and the size of the partial bandwidth adopt the frequency domain position and the size of a predefined partial bandwidth or adopt the frequency domain position and the size of the partial bandwidth configured by the system message.
The method further comprises the following steps:
the base station receives signals and/or channels fed back by the terminal to obtain an optimal beam or an optimal beam group.
After receiving the fed back signals and/or channels, the base station obtains at least one of the following index information to indirectly obtain the optimal beam or the optimal beam group:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The resource index value includes at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
The method of generating the sequence of discovery signals is defined by a predefined manner.
The discovery signal is used for downlink beam index indication and/or time synchronization and/or downlink frequency synchronization.
A method of discovery signal processing, the method comprising:
the terminal receives a plurality of discovery signals in the same time period or different time periods, and obtains index information corresponding to the optimal discovery signal calculated according to a specific rule by detecting the plurality of discovery signals or the plurality of discovery signal groups.
The terminal detects a plurality of discovery signals in a plurality of resource units, wherein the resource units comprise at least one of the following resources: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power resource unit and a discovery signal sequence resource unit.
The time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit is the minimum time unit for distributing time domain resources to the base station; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: transmitting a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by using a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: the plurality of discovery signals or discovery signals within the plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: a plurality of discovery signals or discovery signals within a plurality of discovery signal groups employ a plurality of discovery signal sequences.
The terminal detects the discovery signal according to a full bandwidth or the terminal detects the discovery signal according to a partial bandwidth.
The frequency domain position and size of the partial bandwidth are predefined frequency domain positions and sizes of the partial bandwidth, and/or are configured by system messages.
After detecting the discovery signal, the terminal obtains at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The resource index includes at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
The method further comprises the following steps:
the terminal detects the obtained index value or the corresponding beam index through uplink feedback.
The discovery signal is used for downlink beam index indication and/or time synchronization and/or downlink frequency synchronization.
A discovery signal processing apparatus, the apparatus being a base station configured to:
transmitting a plurality of discovery signals at the same time period or at different time periods; wherein the plurality of discovery signals are from a plurality of discovery signal groups, the plurality of discovery signals within the same discovery signal group have the same discovery signal sequence, and the discovery signal group includes at least one discovery signal;
multiple beams are used for transmitting the discovery signals of multiple discovery signals or multiple discovery signal groups.
The base station is configured to:
transmitting a plurality of discovery signals or discovery signal groups of discovery signals in a plurality of resource units, the resource units comprising at least one of: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power resource unit and a discovery signal sequence resource unit.
The time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups are transmitted by adopting a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: the plurality of discovery signals employs a plurality of discovery signal sequences.
The base station is used for periodically transmitting the discovery signal; the periodicity of transmission is configured and/or predefined by the system message.
The base station transmits the discovery signal in a full bandwidth or transmits the discovery signal in a partial bandwidth.
The frequency domain position and size of the partial bandwidth are predefined frequency domain positions and sizes of the partial bandwidth, and/or are configured by system messages.
The base station is further configured to:
receiving a feedback signal or channel to obtain a feedback index value, thereby obtaining an optimal beam or an optimal beam group.
After receiving the fed back signal or channel, the base station is configured to obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The resource index value includes at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
The sequence for generating the discovery signal is generated in a predefined manner.
A discovery signal processing apparatus, the apparatus being a terminal configured to:
the method includes receiving a plurality of discovery signals in the same time period or different time periods, and detecting the discovery signals of the plurality of discovery signals or the plurality of discovery signal groups to obtain index information corresponding to an optimal discovery signal calculated according to a specific rule.
The terminal is used for:
detecting at different resource units for different discovery signals, the resource units comprising at least one of: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power resource unit and a discovery signal sequence resource unit.
The time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: transmitting a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by using a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of discovery signal sequences.
The terminal is configured to detect the discovery signal according to a full bandwidth, or detect the discovery signal according to a partial bandwidth.
The frequency domain position and size of the partial bandwidth are predefined frequency domain positions and sizes of the partial bandwidth, and/or are configured by system messages.
After detecting the discovery signal, the terminal is configured to obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The resource index value includes at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
The terminal is further configured to feedback the index information obtained after detection through the uplink.
The discovery signal is used for beam index indication and/or downlink time synchronization and/or downlink frequency synchronization.
A processing system of discovery signals comprises a base station and a terminal; wherein,
the base station is used for transmitting a plurality of discovery signals in the same time period or different time periods; wherein the discovery signals of the plurality of discovery signals or the plurality of discovery signal groups are generated by a plurality of sequences, and one or more discovery signals within the same discovery signal group are generated by the same sequence;
transmitting discovery signals of a plurality of discovery signals or a plurality of discovery signal groups by using a plurality of beams;
the terminal is used for receiving a plurality of discovery signals in the same time period or different time periods, and acquiring index information corresponding to the optimal discovery signal calculated according to a specific rule by detecting the discovery signals of the plurality of discovery signals or the plurality of discovery signal groups;
after detecting the discovery signal, the terminal is configured to obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The invention can ensure reliable transmission between the base station and the terminal.
Drawings
Fig. 1 is a schematic diagram of a discovery signal or a discovery signal group transmitted by using different sequences according to an embodiment of the present invention;
fig. 2 is a schematic diagram of sending discovery signals or discovery signal groups in different time domain/frequency domain/power domain resources by using different sequences according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a discovery signal or a discovery signal group sent by using different sequences in different time domain and frequency domain resources according to an embodiment of the present invention;
fig. 4 is a simplified process flow diagram of a discovery signal processing according to an embodiment of the present invention.
Detailed Description
In practical application, the base station and the terminal can discover each other through a discovery process, so that communication is performed by using the optimal weight value. In the discovery process, the transmitting end may enable the receiving end to detect a plurality of beam sequences (discovery signals) by transmitting such sequences in advance. Subsequent communication may be performed after the sender and receiver find each other's presence.
The discovery signal group is merely for illustration, and a plurality of discovery signals may be transmitted using the same sequence, or actually, the discovery signal group may not be defined. The concept of signal groups was found not to affect the protection of the present invention. The beam group includes a plurality of beams, and only for illustrating that the terminal can feed back a plurality of index information or beam indexes, the concept of the beam group does not affect the protection of the present invention.
The rule definition method of the specific rule is many, and for example, a definition method of the optimal signal quality, a definition method of the optimal signal power, or the like may be used.
Specifically, the operations as shown in fig. 4 may be performed, and the base station may transmit a plurality of discovery signals for discovering an optimal transmission beam from the base station to the terminal at the same time period or at different time periods. The discovery signals of the plurality of discovery signals or the plurality of discovery signal groups are generated by a plurality of sequences, and the base station transmits the plurality of discovery signals or the plurality of discovery signal groups using a plurality of beams, one or more discovery signals within the same discovery signal group being generated by the same sequence.
The plurality of discovery signals or discovery signals of the plurality of discovery signal groups may be transmitted in a plurality of resource units, the resource units comprising at least one of the following resources: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power resource unit and a discovery signal sequence resource unit.
The time domain resources may include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit allocates the minimum time unit of the time domain resource for the base station.
The frequency domain resources may include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth;
the spatial domain resources may include: transmitting a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by using a plurality of beams;
the power resources may include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels;
the discovery signal sequence resources may include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of discovery signal sequences.
The base station may periodically transmit the discovery signal; the periodicity of transmission may be configured and/or predefined by system messages.
The base station may transmit the discovery signal in full bandwidth or the base station may transmit the discovery signal in partial bandwidth.
The frequency domain position and size of the partial bandwidth may adopt a predefined frequency domain position and size of the partial bandwidth, and/or adopt a frequency domain position and size of the partial bandwidth configured by the system message.
The base station may receive a signal or a channel fed back by the terminal to obtain corresponding index information, so as to obtain a beam or an optimal beam group that the base station optimizes for the terminal.
The sequence for generating the discovery signal may be generated in a predefined manner, such as: by predefining some parameter values and formulas. The base station may generate a corresponding discovery signal sequence, and the base station and the terminal have a consistent sequence pre-defined method.
After receiving the signal or channel fed back by the terminal, the base station may obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
The terminal can receive a plurality of discovery signals in the same time period or different time periods, and obtains the index information corresponding to the optimal discovery signal calculated according to a specific rule by detecting different discovery signals or different sequences of discovery signal groups; and the terminal can also feed back corresponding index information to the base station for informing the base station of the optimal transmission beam to the terminal.
The terminal may detect at different resource units for different discovery signals, the resource units including at least one of: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power domain resource unit and a discovery signal sequence resource unit.
The time domain resources may include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit allocates the minimum time unit of the time domain resource for the base station.
The frequency domain resources may include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth;
the spatial domain resources may include: transmitting a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by using a plurality of beams;
the power resources may include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels;
the discovery signal sequence resources may include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of discovery signal sequences.
The terminal may detect the discovery signal in full bandwidth or the terminal may detect the discovery signal in partial bandwidth.
The frequency domain position and size of the partial bandwidth may adopt a predefined frequency domain position and size of the partial bandwidth, and/or adopt a frequency domain position and size of the partial bandwidth configured by the system message.
After the terminal detects the discovery signal, at least one of the following index information may be obtained:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
And, the terminal may feed back the index information or the beam index obtained after the detection to the base station through the uplink.
The discovery signal may be used for downlink synchronization.
The discovery signal may be used for time synchronization and/or frequency synchronization of the downlink.
The resource index may include at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In practical system applications it may be possible to include only one discovery signal group consisting of one or more discovery signals. Where the signal groups are merely for illustrating that a group of different discovery signals may have the same sequence, the concept of a related discovery signal group may not exist in practical applications, and such a term description does not limit the present invention.
The base station adopts a two-stage structure to send discovery signals, the first stage sends a first stage discovery signal, the second stage sends a second stage discovery signal, and the two stages of discovery signals jointly form a beam index indication function.
The terminal can detect index information corresponding to an optimal discovery signal group, the index information corresponds to a beam group and is called first-level index information, one beam group comprises at least one beam, then, indexes corresponding to discovery signals in the group can be obtained by further detecting other signals and are called second-level index information, and one beam in one beam group is further determined. And feeding back the two-stage index information through the two-stage index information so as to determine an optimal beam.
The two levels of index information can be combined or correspondingly form a parameter to be fed back to the base station, and the terminal and the base station should have a consistent mode of combining the index information.
The above manner may reduce complexity of detecting the discovery signal by the terminal, for example, N times using the first-stage beam index information, and using a two-stage structure, the terminal detects N1 times only in the first-stage discovery signal, and detects N2 times in the second season, so as to satisfy N1 × N2= N, but the terminal detection times N1+ N2< N reduce complexity of the terminal tip.
Example 1:
as shown in fig. 1, the base station transmits different discovery signals in the same time domain resource unit, the different discovery signals are generated by different sequences, and the base station transmits using different beams for the different discovery signals. Suppose that a base station sends N discovery signals, namely DS 0-DSN-1, in the same time domain resource unit, corresponding sending beams are BF 0-BFN-1, and corresponding discovery signal sequences are SQ 0-SQN-1. When the terminal detects discovery signals in the corresponding time domain resource unit (the number of actually detected discovery signals may be greater than or equal to N), a sequence index corresponding to the optimal signal power or the highest performance index value that can be obtained through correlation detection in the N discovery signal sequences is determined, and the corresponding discovery signal sequence index is fed back to the base station. The base station can acquire the corresponding discovery signal by receiving the discovery signal sequence index fed back by the terminal, so that the corresponding beam can be acquired. In this way, the base station can know the optimal downlink transmission beam for the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
In fact, the terminal may not feed back an index value, and the feedback information functioning as an index value is within the protection scope of the present invention.
Example 2:
as shown in fig. 1, the base station transmits different discovery signals in the same time domain resource unit and different time domain resource units, the different discovery signals are generated by different sequences, and the base station transmits using different beams for the different discovery signals. Suppose that a base station sends discovery signals DS 0-DS 11 in a time domain resource unit 0, corresponding sending beams are BF 0-BF 11, and corresponding discovery signal sequences are SQ 0-SQ 11; suppose that the base station transmits discovery signals DS 12-DS 23 in time domain resource unit 1, the corresponding transmission beams are BF 12-BF 23, and the corresponding discovery signal sequences are SQ 12-SQ 23. When the terminal detects the discovery signals on the time domain resource unit 0 and the time domain resource unit 1 and detects the sequence index corresponding to the optimal signal power or the highest performance index value, assuming that the sequence of the discovery signal corresponding to the optimal discovery signal detected by the terminal is SQ12 and the index is 12, the terminal feeds back the index 12 to the base station through uplink feedback. After obtaining the index 12, the base station finds out the beam corresponding to the SQ12 as BF12, thereby obtaining the downlink optimal beam BF12 from the base station to the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
In fact, the terminal may not feed back an index value, and the feedback information functioning as an index value is within the protection scope of the present invention.
Example 3:
as shown in fig. 2, the base station transmits discovery signals in the same time domain resource unit and different time domain resource units, the discovery signals of different discovery signal groups are generated by different sequences, and the discovery signals in one discovery signal group are generated by the same sequence. And the base station transmits using different beams for different discovery signals. Suppose that a base station sends discovery signals DS 0-DS 11 in a time domain resource unit 0, corresponding sending beams are BF 0-BF 11, and corresponding discovery signal sequences are SQ 0-SQ 11; suppose that the base station transmits discovery signals DS 12-DS 23 in time domain resource unit 1, the corresponding transmission beams are BF 12-BF 23, and the corresponding discovery signal sequences are SQ 0-SQ 11. When the terminal detects discovery signals on a time domain resource unit 0 and a time domain resource unit 1 and detects a time domain resource unit index and a sequence index corresponding to the optimal signal power or the highest performance index value, assuming that the time domain resource unit index of the discovery signal corresponding to the optimal discovery signal detected by the terminal is 0, the sequence is SQ11, and the sequence index is 11, the terminal feeds back the time domain resource unit index 0 and the discovery signal sequence index 11 to the base station through uplink feedback, the base station knows that the time domain resource unit index is 0, finds out a beam corresponding to the time domain resource unit 0 and SQ11 as BF11 after finding out the signal sequence index 11, and obtains a downlink optimal beam BF11 from the base station to the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
The time domain resource unit index and the discovery signal sequence index may be combined or correspond to a parameter fed back to the base station, and the terminal and the base station should have a consistent combination mode for the indexes.
Example 4:
as shown in fig. 2, the base station transmits discovery signals in the same time domain resource unit and different time domain resource units, the discovery signals of different discovery signal groups are generated by different sequences, and the discovery signals in one discovery signal group are generated by the same sequence. And the base station transmits using different beams for different discovery signals. Suppose that a base station sends discovery signals DS 0-DS 11 in a time domain resource unit 0, corresponding sending beams are BF 0-BF 11, corresponding discovery signal sequences are SQ 0-SQ 11, and corresponding power levels are P0; suppose that the base station transmits discovery signals DS 12-DS 23 in time domain resource unit 1, the corresponding transmission beams are BF 12-BF 23, the corresponding power level is P1, and the corresponding discovery signal sequences are SQ 0-SQ 11. When the terminal detects discovery signals on a time domain resource unit 0 and a time domain resource unit 1 and detects a time domain resource unit index and a sequence index corresponding to the optimal signal power or the highest performance index value, assuming that the terminal detects that the power level of the discovery signal corresponding to the optimal discovery signal is P0, the corresponding power level index is 0, the sequence is SQ11, and the corresponding discovery signal sequence index is 11, the terminal feeds back the power level index 0 and the discovery signal sequence index 11 to the base station through uplink feedback, the base station learns that the power level index is 0, finds out a beam corresponding to the power level index 0 and SQ11 as BF11 after finding out the signal sequence index 11, and obtains a downlink optimal beam BF11 from the base station to the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
The power level index and the discovery signal sequence index may be combined or correspond to a parameter fed back to the base station, and the terminal and the base station should have a consistent combination mode for the indexes.
Example 5:
as shown in fig. 2, the base station transmits discovery signals in the same time domain resource unit and/or different time domain resource units, discovery signal groups of different discovery signals are generated by different sequences, discovery signals within one discovery signal group are generated by the same sequence, and different discovery signals having the same discovery signal sequence may constitute one discovery signal group. And the base station transmits using different beams for different discovery signals. Suppose that the base station transmits discovery signals DS 0-DS 11 in frequency domain resource unit 0, the corresponding transmission beams are BF 0-BF 11, and the corresponding discovery signal sequences are SQ 0-SQ 11. Suppose that the base station transmits discovery signals DS 12-DS 23 in frequency domain resource unit 1, the corresponding transmission beams are BF 12-BF 23, and the corresponding discovery signal sequences are SQ 0-SQ 11. The terminal detects discovery signals on a frequency domain resource unit 0 and a frequency domain resource unit 1, detects a frequency domain resource unit index and a sequence index corresponding to the optimal signal power or the highest performance index value, and assumes that the frequency domain resource unit index of the discovery signal corresponding to the optimal discovery signal detected by the terminal is 0, the sequence is SQ11, and the sequence index is 11, then the terminal feeds back the frequency domain resource unit index 0 and the discovery signal sequence index 11 to the base station through uplink feedback, the base station knows that the frequency domain resource unit index is 0, finds out a beam corresponding to the frequency domain resource unit 0, SQ11 as BF11 after finding out the signal sequence index 11, and obtains a downlink optimal beam BF11 from the base station to the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
The frequency domain resource unit index and the discovery signal sequence index may be combined or correspond to a parameter fed back to the base station, and the terminal and the base station should have a consistent combination mode for the indexes.
Example 6:
as shown in fig. 3, the base station transmits discovery signals in the same time domain resource unit and different time domain resource units, different discovery signal groups are generated by different sequences, the discovery signals in one discovery signal group are generated by the same sequence, and different discovery signals having the same discovery signal sequence may constitute one discovery signal group. And the base station transmits using different beams for different discovery signals. Suppose that the base station sends discovery signals DS 0-DS 8 in time domain resource unit 0 and frequency domain resource unit 0, the corresponding sending beams are BF 0-BF 8, and the corresponding discovery signal sequences are SQ 0-SQ 8; the base station transmits discovery signals DS 9-DS 17 in time domain resource unit 0 and frequency domain resource unit 1, corresponding transmission beams are BF 9-BF 17, and corresponding discovery signal sequences are SQ 0-SQ 8. The base station transmits discovery signals DS 18-DS 26 in time domain resource unit 1 and frequency domain resource unit 0, corresponding transmission beams are BF 18-BF 26, and corresponding discovery signal sequences are SQ 0-SQ 8. The base station transmits discovery signals DS 27-DS 35 in time domain resource unit 1 and frequency domain resource unit 1, corresponding transmission beams are BF 27-BF 35, and corresponding discovery signal sequences are SQ 0-SQ 8. When the terminal detects discovery signals on the frequency domain resource unit 0 and the frequency domain resource unit 1 of the time domain resource unit 0 and the time domain resource unit 1 respectively, and detects the time domain resource unit index, the frequency domain resource unit index and the discovery signal sequence index corresponding to the optimal signal power or the highest performance index value, assuming that the time domain resource unit index of the discovery signal corresponding to the optimal discovery signal detected by the terminal is 0, the frequency domain resource unit index is 1, the discovery signal sequence is SQ8, and the sequence index is 8, the terminal feeds back the time domain resource unit index 0, the frequency domain resource unit index 1 and the discovery signal sequence index 8 to the base station through uplink feedback, and the base station finds the time domain resource unit 0 and the frequency domain resource unit 1 after learning the time domain resource unit index 0, the frequency domain resource unit index 1 and the discovery signal sequence index 11, the beam corresponding to SQ8 is BF17, and BF17 is the optimal downlink beam from the base station to the terminal. The base station may refer to the corresponding optimal beam for the next downlink data transmission for the terminal.
The time domain resource unit index, the frequency domain resource unit index and the discovery signal sequence index may be combined or correspond to a parameter to be fed back to the base station, and the terminal and the base station should have a consistent combination mode aiming at the indexes.
Example 7:
in the above embodiment, the time domain resource unit may include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval, and basic time domain resource unit. The frequency domain resource units may include at least one of: subcarrier, subband, fractional bandwidth, discovery signal bandwidth. The spatial domain resources may include: and detecting different discovery signals or discovery signal groups simultaneously on the same time-frequency resource, wherein different discovery signals or discovery signal groups adopt different beams. The power resources may include: different discovery signals or groups of discovery signals employ different transmit power levels.
Example 8:
in the above embodiments, the base station may transmit the discovery signal according to a full bandwidth, or the base station may transmit the discovery signal according to a partial bandwidth. The frequency domain position and size of the partial bandwidth may adopt a predefined frequency domain position and size of the partial bandwidth, and/or adopt a frequency domain position and size of the partial bandwidth configured by the system message. For example: and then the base station informs the terminal of the frequency domain position and size information of which partial bandwidth in the predefined frequency domain position and size information of several partial bandwidths is adopted by the base station through a system message.
The terminal may detect the discovery signal in full bandwidth or the terminal may detect the discovery signal in partial bandwidth. The frequency domain position and size of the partial bandwidth may adopt a predefined frequency domain position and size of the partial bandwidth, and/or adopt a frequency domain position and size of the partial bandwidth configured by the system message. For example: and then the terminal obtains the frequency domain position and size information of which partial bandwidth in the frequency domain position and size information of the predefined several partial bandwidths is adopted by receiving the system message.
The sequence for generating the discovery signal may be generated in a predefined manner, such as: by predefining some parameter values and formulas. The base station and the terminal may generate corresponding discovery signal sequences. And the base station and the terminal may have a consistent sequence pre-defined method.
For example: the predefined 36 parameters can generate 36 sequences or sequence groups by using a specific formula, the index can be 0-35, and different sequences or sequences in different sequence groups can respectively correspond to 36 discovery signal sequences. The base station transmits 36 sequences or sequences in 36 sequence groups, each sequence corresponding to a beam. The terminal detection sequence can obtain the corresponding index value and feeds the index value back to the base station, and the base station can obtain the beam corresponding to the index value after obtaining the index value.
Generally, the base station may divide a plurality of discovery signal sequences into groups, and the terminal may only feed back a discovery signal sequence group number corresponding to the discovery signal sequence after detecting the discovery signal.
Example 9:
in order to accurately detect the time domain resource unit index and the frequency domain resource unit index, a related time synchronization process and frequency synchronization process are required, and the discovery signal in the above embodiment may be used for downlink time synchronization and frequency synchronization. When detecting the discovery signal, the terminal may first perform time and frequency synchronization using the discovery signal, and then detect at least one of the corresponding time domain resource unit index, frequency domain resource unit index, power level index, and discovery signal sequence index.
Example 10:
the base station adopts a two-stage structure to send discovery signals, the first stage sends a first stage discovery signal, the second stage sends a second stage discovery signal, and the two stages of discovery signals jointly form a beam index indication function.
The terminal can detect index information corresponding to an optimal discovery signal group, the index information corresponds to a beam group and is called first-level index information, one beam group comprises at least one beam, then, indexes corresponding to discovery signals in the group can be obtained by further detecting other signals and are called second-level index information, and one beam in one beam group is further determined. And feeding back the two-stage index information through the two-stage index information so as to determine an optimal beam.
The two levels of index information can be combined or correspondingly form a parameter to be fed back to the base station, and the terminal and the base station should have a consistent mode of combining the index information.
The above manner may reduce complexity of detecting the discovery signal by the terminal, for example, N times using the first-stage beam index information, and using a two-stage structure, the terminal detects N1 times only in the first-stage discovery signal, and detects N2 times in the second season, so as to satisfy N1 × N2= N, but the terminal detection times N1+ N2< N reduce complexity of the terminal tip.
The discovery signal described in the present invention is only for explaining that a sequence or a signal can support the base station to transmit the sequence or the signal in a beam, the terminal can identify and feed back the corresponding sequence or discovery signal index, and the base station can obtain the function of the corresponding transmission beam when obtaining the sequence or the signal. The name "discovery signal" does not have any limitation on the present invention, and in practical applications, the corresponding names may vary, and sequences, signals or channels having the same function as or including the "discovery signal" function are included in the inventive idea of the present invention. In addition, the invention does not exclude that the discovery signal can simultaneously play the role of a synchronization signal, and a signal can be used for simultaneously carrying out a synchronization process and a discovery process. The synchronization may include time synchronization and/or frequency domain synchronization.
In the present invention, there are many methods for detecting the optimal sequence by the terminal, for example, a sequence correlation method is adopted, such as: and selecting the sequence index with the highest correlation value for feedback. Different criteria may select different sequence indices and are not limiting on the invention.
In summary, no matter the method, the device embodied by the base station, the terminal, or the system composed of the device, according to the present invention, the base station can transmit the discovery signal with the beam characteristic, and the terminal obtains the optimal index information or a set of index information that makes the terminal receiving performance satisfy a specific rule through the discovery signal, for example: one or a set of index information with the best signal quality is received and the corresponding index information is fed back to the base station. After obtaining the index information, the base station can obtain the optimal beam when the base station transmits data to the terminal. When the base station sends data to the terminal, the beam is preferably used for data transmission, so that reliable transmission between the base station and the terminal is ensured.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (18)
1. A method for processing a discovery signal, the method comprising:
the base station sends a plurality of discovery signals to the terminal in the same time period or different time periods; wherein the plurality of discovery signals are from a plurality of discovery signal groups, the plurality of discovery signals within the same discovery signal group have the same discovery signal sequence, and the discovery signal group includes at least one discovery signal;
the base station transmits a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by adopting a plurality of beams;
the base station receives signals and/or channels fed back by the terminal to obtain an optimal beam or an optimal beam group.
2. The method of claim 1,
the plurality of discovery signals or discovery signals within the plurality of discovery signal groups are transmitted in a plurality of resource units, the resource units comprising at least one of the following resources: time domain resources, frequency domain resources, space domain resources, power resources, discovery signal sequence resources.
3. The method of claim 2,
the time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit is the minimum time unit for distributing time domain resources to the base station; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups are transmitted by adopting a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: a plurality of discovery signals or discovery signals of a plurality of discovery signal groups employ a plurality of discovery signal sequences.
4. The method of claim 1, wherein a base station periodically transmits the discovery signal; the periodicity of transmission is configured and/or predefined by the system messages.
5. The method of claim 1, wherein the base station transmits the discovery signal in a full bandwidth or wherein the base station transmits the discovery signal in a partial bandwidth.
6. The method of claim 5,
and the frequency domain position and the size of the partial bandwidth adopt the frequency domain position and the size of a predefined partial bandwidth or adopt the frequency domain position and the size of the partial bandwidth configured by the system message.
7. The method of claim 1, wherein the base station receives the fed back signals and/or channels and obtains at least one of the following index information to indirectly obtain the optimal beam or the optimal beam group:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
8. The method of claim 7, wherein the resource index value comprises at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
9. The method of claim 1, wherein a method of generating the sequence of discovery signals is defined by a predefined manner.
10. The method of claim 1, wherein the discovery signal is used for downlink beam index indication and/or time synchronization and/or downlink frequency synchronization.
11. A method for processing a discovery signal, the method comprising:
the terminal receives a plurality of discovery signals sent by the base station in the same time period or different time periods, and obtains index information corresponding to the optimal discovery signal calculated according to a specific rule by detecting the plurality of discovery signals or the plurality of discovery signal groups; the specific rule is that the received signal quality is optimal or the received signal power is optimal;
wherein the plurality of discovery signals are from a plurality of discovery signal groups, the plurality of discovery signals within the same discovery signal group have the same discovery signal sequence, and the discovery signal group includes at least one discovery signal;
the terminal feeds back an index value obtained by detection or a corresponding beam index to the base station through an uplink;
after detecting the discovery signal, the terminal obtains at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
12. The method of claim 11,
the terminal detects a plurality of discovery signals in a plurality of resource units, wherein the resource units comprise at least one of the following resources: the system comprises a time domain resource unit, a frequency domain resource unit, a space domain resource unit, a power resource unit and a discovery signal sequence resource unit.
13. The method of claim 12,
the time domain resources include at least one of: OFDM symbol, OFDM symbol group, subframe, wireless frame, micro frame, sending time interval and basic time domain resource unit; wherein the group of OFDM symbols includes at least one OFDM symbol; the basic time domain resource unit is the minimum time unit for distributing time domain resources to the base station; and/or the presence of a gas in the gas,
the frequency domain resources include at least one of: subcarrier, subband, partial bandwidth, discovery signal bandwidth; and/or the presence of a gas in the gas,
the spatial domain resources include: transmitting a plurality of discovery signals or discovery signals of a plurality of discovery signal groups by using a plurality of beams; and/or the presence of a gas in the gas,
the power resources include: the plurality of discovery signals or discovery signals within the plurality of discovery signal groups employ a plurality of power levels; and/or the presence of a gas in the gas,
the discovery signal sequence resources include: a plurality of discovery signals or discovery signals within a plurality of discovery signal groups employ a plurality of discovery signal sequences.
14. The method of claim 12, wherein the terminal detects the discovery signal according to a full bandwidth or the terminal detects the discovery signal according to a partial bandwidth.
15. The method of claim 14,
the frequency domain position and size of the partial bandwidth are predefined frequency domain positions and sizes of the partial bandwidth, and/or are configured by system messages.
16. The method of claim 11, wherein the resource index comprises at least one of: time domain resource index, frequency domain resource index, power domain resource index, and sequence domain resource index.
17. The method of claim 11, wherein the discovery signal is used for downlink beam index indication and/or time synchronization and/or downlink frequency synchronization.
18. A system for processing discovery signals, the system comprising a base station, a terminal; wherein,
the base station is used for sending a plurality of discovery signals to the terminal in the same time period or different time periods; wherein the discovery signals of the plurality of discovery signals or the plurality of discovery signal groups are generated by a plurality of sequences, and one or more discovery signals within the same discovery signal group are generated by the same sequence;
transmitting discovery signals of a plurality of discovery signals or a plurality of discovery signal groups by using a plurality of beams;
receiving signals and/or channels fed back by the terminal to obtain an optimal beam or an optimal beam group;
after receiving the fed back signal or channel, the base station is configured to obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
a transmission power level index value corresponding to the optimal discovery signal;
the terminal is used for receiving a plurality of discovery signals sent by the base station in the same time period or different time periods, and acquiring index information corresponding to the optimal discovery signal calculated according to a specific rule by detecting the discovery signals of the plurality of discovery signals or the plurality of discovery signal groups; the specific rule is that the received signal quality is optimal or the received signal power is optimal;
the index value obtained by the uplink feedback detection or the corresponding beam index is sent to the base station;
after detecting the discovery signal, the terminal is configured to obtain at least one of the following index information:
an optimal discovery signal sequence index or discovery signal group index or equivalent index value;
sending a time domain resource index value corresponding to the optimal discovery signal;
sending a frequency domain resource index value corresponding to the optimal discovery signal;
and transmitting power level index value corresponding to the optimal discovery signal.
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| CN108365937B (en) * | 2017-01-26 | 2020-05-15 | 中国移动通信有限公司研究院 | Transmission method, transmission system, base station and terminal of reference signal |
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| KR101704984B1 (en) * | 2008-05-09 | 2017-02-08 | 애플 인크. | System and method for supporting antenna beamforming in a cellular network |
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