CN108174356B - Uplink feedback method and device for users in group calling service of broadband cluster system - Google Patents
Uplink feedback method and device for users in group calling service of broadband cluster system Download PDFInfo
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- CN108174356B CN108174356B CN201711434077.XA CN201711434077A CN108174356B CN 108174356 B CN108174356 B CN 108174356B CN 201711434077 A CN201711434077 A CN 201711434077A CN 108174356 B CN108174356 B CN 108174356B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
Abstract
The invention provides an uplink feedback method for users in group calling service of a broadband trunking system, which comprises the steps that a wireless base station establishes a plurality of groups, and a corresponding feedback channel is distributed to each group, the feedback channels of the groups jointly occupy 1RB time-frequency domain resources, the utilization rate of system resources is improved, a user terminal detects downlink data sent by the wireless base station, when the downlink data are detected to be wrong, a feedback signal in a preset format is sent to the wireless base station on the feedback channel distributed by the wireless base station, if the downlink data are normal, the feedback signal is not sent, the user terminal resources are saved, the blind detection difficulty of the wireless base station is reduced, the feedback signal in the preset format comprises a front-end protection interval and a rear-end protection interval, and the problem of uplink asynchronization caused by time delay and lead time delay is avoided. Based on the uplink feedback method provided by the invention, the idle-state user terminal uplink feedback becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
Description
Technical Field
The present invention relates to the field of broadband wireless communication, and more particularly, to an uplink feedback method and apparatus for users in group call service in a broadband trunking system.
Background
Group Call (Group Call) is one of the most common communication services in LTE Trunking Communications (Trunking Communications). When group calling service is carried out, all users in a group share a downlink cluster dedicated channel, namely all users use the same downlink resource, only a main calling user is in an RRC connection state, other users are basically in an RRC idle state, uplink feedback of a downlink data receiving state can be carried out on a terminal in the RRC connection state through multiplexing of a PUCCH channel or a PUSCH channel in a public network standard, and uplink feedback is not carried out on the terminal in the RRC idle state. The CCSA standard also defines no uplink feedback for group call services.
Therefore, the group call service usually adopts a conservative scheduling mode, but this results in a great waste of system resources, and when some user channels in a group deteriorate, the system cannot be adjusted in real time, thereby reducing the stability of the system.
Disclosure of Invention
In view of this, the present invention provides an uplink feedback method and apparatus for a user in a group call service in a broadband trunking system, which can satisfy that an idle terminal performs uplink feedback in time under the group call service, and occupy a small amount of resources.
The specific technical scheme is as follows:
an uplink feedback method for users in group call service of broadband trunking system is applied to a wireless base station, and the method comprises the following steps:
establishing a plurality of groups, and allocating a corresponding feedback channel for each group, so that when downlink data received by the user terminal in each group is wrong, feedback is performed through the corresponding feedback channel;
blind detection is carried out on the feedback channels of all the groups in real time;
and when a data error feedback signal of the user terminal is detected, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode.
Optionally, the allocating a corresponding feedback channel to each group includes:
a common feedback channel is allocated to each of the groups.
Optionally, the allocating a corresponding feedback channel to each group includes:
determining the priority of each user terminal in each group, wherein the priority comprises a first priority and a second priority;
allocating a feedback channel for each first priority user terminal;
and grouping the second priority user terminals in each group respectively, and distributing a common feedback channel for the second priority user terminals of each group.
Preferably, the preset number of feedback channels jointly occupy 1RB time-frequency domain resources, where the time-frequency domain resources include two slots, and each user terminal transmits a code division feedback signal on the Slot.
Preferably, the blind detection of the feedback channel of each group in real time includes:
detecting in real time whether a feedback signal on a feedback channel from each of the groups is received;
and when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value, judging that the feedback signal is a data error feedback signal sent by the user terminal.
Optionally, when detecting a data error feedback signal of the user terminal, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode includes:
determining a group where a user terminal is located according to a cyclic shift value in a data error feedback signal of the user terminal;
and reducing the code rate of sending data to the group where the user terminal is located.
Optionally, when detecting a data error feedback signal of the user terminal, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode includes:
determining the priority of the user terminal according to a cyclic shift value in a data error feedback signal of the user terminal;
when the user terminal is in the first priority level, retransmitting data to the user terminal;
and when the user terminal has the second priority, reducing the code rate of sending data to the group in which the user terminal is positioned.
An uplink feedback device for users in group call service of broadband trunking system, applied to wireless base station, includes:
the group establishing unit is used for establishing a plurality of groups and distributing a corresponding feedback channel for each group, so that when the downlink data received by the user terminal in each group is wrong, the feedback is carried out through the corresponding feedback channel;
the blind detection unit is used for carrying out blind detection on the feedback channels of all the groups in real time;
and the feedback processing unit is used for performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode when a data error feedback signal of the user terminal is detected.
Optionally, the group establishing unit is specifically configured to establish a plurality of groups, and allocate a common feedback channel to each group.
Optionally, the group establishing unit includes:
a first determining subunit, configured to determine priorities of user terminals in each of the groups, where the priorities include a first priority and a second priority;
the first allocating subunit is used for allocating a feedback channel to each first priority user terminal;
and the second allocating subunit is used for respectively allocating the second priority user terminals in each group and allocating a common feedback channel for the second priority user terminals of each group.
Preferably, the blind detection unit includes:
the detection subunit is used for detecting whether feedback signals from the feedback channels of the groups are received in real time;
and the judging subunit is used for judging that the feedback signal is a data error feedback signal sent by the user terminal when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value.
Optionally, the feedback processing unit includes:
a second determining subunit, configured to determine, according to a cyclic shift value in a data error feedback signal of a user terminal, a group in which the user terminal is located;
a first processing subunit, configured to reduce a code rate for sending data to a group in which the user terminal is located.
Optionally, the feedback processing unit includes:
a third determining subunit, configured to determine a priority of the ue according to a cyclic shift value in a data error feedback signal of the ue;
a second processing subunit, configured to retransmit data to the user terminal when the user terminal has a first priority;
and the third processing subunit is configured to, when the user terminal has the second priority, reduce a code rate for transmitting data to a group in which the user terminal is located.
An uplink feedback method for users in group call service of broadband cluster system is applied to user terminals, and the method comprises the following steps:
receiving downlink data transmitted by a wireless base station;
detecting the downlink data;
and when the downlink data error is detected, sending a feedback signal in a preset format to the wireless base station on a feedback channel allocated by the wireless base station, wherein the feedback signal in the preset format comprises a front-end guard interval and a rear-end guard interval.
Preferably, the feedback signal in the preset format further includes a cyclic prefix and feedback data between the front-end guard interval and the back-end guard interval, the lengths of the cyclic prefix and the feedback data are two time domain symbols, the data in the cyclic prefix and the feedback data are the same, and an orthogonal sequence with a cyclic shift value mapped on each carrier is arranged.
An uplink feedback device for users in group call service of broadband cluster system is applied to user terminals, and comprises:
a receiving unit configured to receive downlink data transmitted by a wireless base station;
a detection unit, configured to detect the downlink data;
and a feedback unit, configured to send a feedback signal in a preset format to the radio base station on a feedback channel allocated by the radio base station when the downlink data error is detected, where the feedback signal in the preset format includes a front-end guard interval and a back-end guard interval.
There is also provided a radio base station, comprising: a first communication device for communicating with a user terminal; a first memory for storing a program; a first processor for executing the program, the first processor implementing the method as applied to a radio base station when executing the program.
There is also provided a user terminal, the user terminal comprising: a second communication device for communicating with the wireless base station; a second memory for storing a program; a second processor for executing the program, the second processor implementing the method applied to the user terminal when executing the program.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an uplink feedback method for users in group calling service of a broadband trunking system, which comprises the steps that a wireless base station establishes a plurality of groups, and a corresponding feedback channel is distributed to each group, the feedback channels of the groups jointly occupy 1RB time-frequency domain resources, the utilization rate of system resources is improved, a user terminal detects downlink data sent by the wireless base station, when the downlink data are detected to be wrong, a feedback signal in a preset format is sent to the wireless base station on the feedback channel distributed by the wireless base station, if the downlink data are normal, the feedback signal is not sent, the user terminal resources are saved, the blind detection difficulty of the wireless base station is reduced, the feedback signal in the preset format comprises a front-end protection interval and a rear-end protection interval, and the problem of uplink asynchronization caused by time delay and lead time delay is avoided. Based on the uplink feedback method provided by the invention, the idle-state user terminal uplink feedback becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is an exemplary diagram of a group call feedback scenario;
fig. 2 is a flowchart of an uplink feedback method for a user in a group call service in a broadband trunking system according to some embodiments of the present invention;
FIG. 3 is a schematic diagram of a feedback channel design disclosed in some embodiments of the invention;
fig. 4 is a schematic structural diagram of an uplink feedback device of a user in a group call service in a broadband trunking system, which is disclosed in some embodiments of the present invention;
fig. 5 is a flowchart of an uplink feedback method for a user in a group call service in a broadband trunking system according to some embodiments of the present invention;
fig. 6 is a functional diagram of a delay-advance front-end guard interval F-GAP according to some embodiments of the present invention;
fig. 7 is a schematic data layout of the feedback data Date according to some embodiments of the present invention;
fig. 8 is a functional diagram of a delay lag back end guard interval E-GAP according to some embodiments of the present invention;
fig. 9 is a schematic structural diagram of an uplink feedback device for a user in a group call service in a broadband trunking system, disclosed in some embodiments of the present invention;
fig. 10 is a schematic structural diagram of a wireless base station according to some embodiments of the present invention;
fig. 11 is a schematic structural diagram of a ue according to some embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, in a group service, a user terminal may cause a situation that a user terminal (UE) behind a building has a data receiving error due to a change of a signal environment, for example, due to a building blockage shown in fig. 1.
In view of the above problem, this embodiment discloses an uplink feedback method for users in group call service in broadband trunking system, which is applied to a wireless base station, please refer to fig. 2, and the method specifically includes the following steps:
s101: establishing a plurality of groups, and allocating a corresponding feedback channel for each group, so that when downlink data received by the user terminal in each group is wrong, feedback is performed through the corresponding feedback channel;
it can be understood that, when the radio base station transmits a downlink data, the multiple ues in the group receive the downlink data simultaneously, and the location of each ue is different, which may cause some ues to receive the data incorrectly and other ues to receive the data normally.
When a group is established, the wireless base station allocates a corresponding feedback channel to each group.
The first distribution mode is as follows:
and allocating a common feedback channel to each group, that is, each group corresponds to one feedback channel, and all the user terminals in the group feed back a feedback signal with data error to the radio base station through the same feedback channel.
In this mode, the radio base station can only distinguish which group the user terminal is from by the feedback signal, but accordingly, this mode can effectively save resources.
And a second distribution mode:
determining the priority of each user terminal in each group, wherein the priority comprises a first priority and a second priority; allocating a feedback channel for each first priority user terminal; and grouping the second priority user terminals in each group respectively, and distributing a common feedback channel for the second priority user terminals of each group.
It can be understood that the first priority is higher than the second priority, that is, the first priority ue is an important ue, the radio base station allocates a dedicated feedback channel to the first priority ue, the second priority ue is a normal ue, the radio base station groups the second priority ues in each group, the number of the second priority ues in each group can be adjusted by the radio base station according to the actual situation, a common feedback channel is allocated to the second priority ue in each group, and all the second priority ues in the group feed back a feedback signal of a data error to the radio base station through the same feedback channel.
In this mode, the wireless base station can distinguish the priority of the user terminal through the feedback signal, that is, the wireless base station can distinguish whether the feedback user terminal is an important client, and can distinguish which specific group in which group the feedback user terminal comes from when the feedback user terminal is determined to be a common client.
S102: blind detection is carried out on the feedback channels of all the groups in real time;
specifically, the execution process of S102 is as follows:
detecting in real time whether a feedback signal on a feedback channel from each of the groups is received;
and when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value, judging that the feedback signal is a data error feedback signal sent by the user terminal.
It should be noted that the radio base station does not know that the user terminal has transmitted the feedback signal, and because the feedback is code division resource feedback, it cannot be determined which code channels have been fed back, and therefore it is necessary to determine whether the user terminal has transmitted the feedback signal by blind detection.
S103: and when a data error feedback signal of the user terminal is detected, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode.
Specifically, two feedback processing modes are disclosed in this embodiment, corresponding to the two modes of allocating feedback channels in S101.
It should be noted that the feedback signal of the user terminal includes an orthogonal sequence with a cyclic shift value, and the orthogonal sequences in the feedback signals transmitted in different feedback channels are the same, but the cyclic shift values are different, so that the feedback channels can be distinguished according to the cyclic shift values.
The feedback channels are designed as shown in fig. 3, a preset number of feedback channels jointly occupy 1RB time-frequency domain resources, the time-frequency domain resources include two slots, and each user terminal transmits a code division feedback signal on the slots.
It is understood that the number of feedback channels allowed in the 1RB time-frequency domain resource is limited, and the preset number is an upper limit of the number of feedback channels allowed in the 1RB time-frequency domain resource.
In the uplink feedback method for users in the group call service of the broadband trunking system provided by this embodiment, the wireless base station establishes a plurality of groups, and allocates corresponding feedback channels to each group, and the preset number of feedback channels jointly occupy 1RB of time-frequency domain resources, thereby improving the utilization rate of system resources.
A first feedback processing mode:
based on the first allocation mode, determining a group where the user terminal is located according to a cyclic shift value in a data error feedback signal of the user terminal in the first allocation mode; and reducing the code rate of sending data to the group where the user terminal is located.
Feedback mode two
Based on the second allocation mode, determining the priority of the user terminal according to the cyclic shift value in the data error feedback signal of the user terminal in the second allocation mode; when the user terminal is in the first priority level, retransmitting data to the user terminal; and when the user terminal has the second priority, reducing the code rate of sending data to the group in which the user terminal is positioned.
In the uplink feedback method for users in the group call service of the broadband trunking system provided in this embodiment, the wireless base station establishes a plurality of groups, and allocates corresponding feedback channels to each group, and the preset number of feedback channels jointly occupy 1RB time-frequency domain resources, which improves the utilization rate of system resources.
Example two
Referring to fig. 4, the present embodiment discloses an uplink feedback device for a user in a group call service in a broadband trunking system, which is applied to a wireless base station, and includes:
a group establishing unit 101, configured to establish multiple groups, and allocate a corresponding feedback channel to each group, so that when downlink data received by a user terminal in each group is incorrect, feedback is performed through the corresponding feedback channel;
a blind detection unit 102, configured to perform blind detection on the feedback channels of each group in real time;
optionally, the group establishing unit 101 is specifically configured to establish a plurality of groups, and allocate a common feedback channel to each group.
Optionally, the group establishing unit 101 includes:
a first determining subunit, configured to determine priorities of user terminals in each of the groups, where the priorities include a first priority and a second priority;
the first allocating subunit is used for allocating a feedback channel to each first priority user terminal;
and the second allocating subunit is used for respectively allocating the second priority user terminals in each group and allocating a common feedback channel for the second priority user terminals of each group.
Specifically, the blind detection unit 102 includes:
the detection subunit is used for detecting whether feedback signals from the feedback channels of the groups are received in real time;
and the judging subunit is used for judging that the feedback signal is a data error feedback signal sent by the user terminal when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value.
The feedback processing unit 103 is configured to perform feedback processing on a group where the user terminal is located according to a preset feedback processing mode when detecting a data error feedback signal of the user terminal.
Corresponding to the two options of the group establishing unit 101, the feedback processing unit 103 also has two options:
optionally, the feedback processing unit 103 includes:
a second determining subunit, configured to determine, according to a cyclic shift value in a data error feedback signal of a user terminal, a group in which the user terminal is located;
a first processing subunit, configured to reduce a code rate for sending data to a group in which the user terminal is located.
Optionally, the feedback processing unit 103 includes:
a third determining subunit, configured to determine a priority of the ue according to a cyclic shift value in a data error feedback signal of the ue;
a second processing subunit, configured to retransmit data to the user terminal when the user terminal has a first priority;
and the third processing subunit is configured to, when the user terminal has the second priority, reduce a code rate for transmitting data to a group in which the user terminal is located.
In the uplink feedback device for users in the group call service of the broadband trunking system provided by this embodiment, the wireless base station establishes a plurality of groups, and allocates a corresponding feedback channel to each group, and the plurality of feedback channels occupy 1RB time-frequency domain resources together, thereby improving the utilization rate of system resources. Based on the uplink feedback device provided by the embodiment, the uplink feedback of the idle-state user terminal becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
EXAMPLE III
Referring to fig. 5, the present embodiment discloses an uplink feedback method for a user in a group call service in a broadband trunking system, which is applied to a user terminal, and the method specifically includes the following steps:
s201: receiving downlink data transmitted by a wireless base station;
s202: detecting the downlink data;
s203: and when the downlink data error is detected, sending a feedback signal in a preset format to the wireless base station on a feedback channel allocated by the wireless base station, wherein the feedback signal in the preset format comprises a front-end guard interval and a rear-end guard interval.
It can be understood that, when the downlink data received by the user terminal is normal, no feedback signal is sent, so that the user terminal resources are saved, and the difficulty of blind detection of the wireless base station is reduced.
Specifically, referring to fig. 3, the feedback signal in the preset format includes a front end guard interval F-GAP, a back end guard interval E-GAP, and a cyclic prefix cp (cyclic prefix) and feedback data Date between the front end guard interval F-GAP and the back end guard interval E-GAP.
Referring to fig. 6, the length of the front end guard interval F-GAP is a time domain symbol, where no data is sent, and when the RRC idle state may have uplink out-of-step, the front end guard interval F-GAP is used to protect the situation of delay advance, and does not affect the previous subframe data.
The length of the cyclic prefix CP (cyclic prefix) and the length of the feedback data Date are two time domain symbols respectively, the data in the cyclic prefix CP (cyclic prefix) and the feedback data Date are the same, and an orthogonal sequence with a cyclic shift value mapped on each carrier wave is arranged. In the OFDM system, a cyclic prefix cp (cyclic prefix) is used to protect orthogonality between data, and prevent a problem that data cannot be analyzed due to delay lag occurring after uplink desynchronization.
Fig. 7 is a schematic diagram of data arrangement of feedback data Date, where the Date includes 12 groups of carriers, and data mapped on each carrier
Meter (2)The calculation formula is as follows:
wherein, alpha is a cyclic shift value, and n is a carrier number.
Where φ (n) is a sequence index.
Referring to fig. 8, the back-end guard interval E-GAP does not send any data during the interval, and when the delay lag Time exceeds 160ts (basic Time unit), the data of the next following subframe is not affected.
In the uplink feedback method for the user in the group call service of the broadband trunking system provided by this embodiment, the user terminal detects downlink data sent by the wireless base station, and when detecting that the downlink data is erroneous, sends a feedback signal in a preset format to the wireless base station on a feedback channel allocated by the wireless base station, and if the downlink data is normal, does not send a feedback signal, so that user terminal resources are saved, the difficulty of blind detection of the wireless base station is reduced, and the feedback signal in the preset format includes a front-end guard interval and a rear-end guard interval, thereby avoiding the problem of uplink asynchronization caused by delay lead and delay lag. Based on the uplink feedback method provided by the embodiment, the idle-state user terminal uplink feedback becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
Example four
Referring to fig. 9, the present embodiment correspondingly discloses an uplink feedback device for a user in a group call service of a broadband trunking system, which includes:
a receiving unit 201, configured to receive downlink data transmitted by a wireless base station;
a detecting unit 202, configured to detect the downlink data;
a feedback unit 203, configured to send a feedback signal in a preset format to the radio base station on a feedback channel allocated by the radio base station when the downlink data error is detected, where the feedback signal in the preset format includes a front-end guard interval and a back-end guard interval.
In the uplink feedback device for the user in the group call service of the broadband trunking system provided by this embodiment, the user terminal detects downlink data sent by the wireless base station, when the downlink data is detected to be erroneous, a feedback signal in a preset format is sent to the wireless base station on a feedback channel allocated by the wireless base station, and if the downlink data is normal, the feedback signal is not sent, so that user terminal resources are saved, the difficulty of blind detection of the wireless base station is reduced, and the feedback signal in the preset format includes a front-end guard interval and a rear-end guard interval, thereby avoiding the problem of uplink asynchronization caused by delay lead and delay lag. Based on the uplink feedback device provided by the embodiment, the uplink feedback of the idle-state user terminal becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
Referring to fig. 10, the present embodiment discloses a wireless base station, which includes: a first communication device 301, a first memory 302, and a first processor 303;
the first communication device 301 is configured to communicate with a user terminal;
the first memory 302 is used for storing programs;
the first processor 303 is configured to execute the program, and when the first processor 303 executes the program, the uplink feedback method of the user in the group call service of the broadband trunking system applied to the wireless base station disclosed in the foregoing embodiment is implemented;
the method specifically comprises the following steps:
establishing a plurality of groups, and allocating a corresponding feedback channel for each group, so that when downlink data received by the user terminal in each group is wrong, feedback is performed through the corresponding feedback channel;
blind detection is carried out on the feedback channels of all the groups in real time;
and when a data error feedback signal of the user terminal is detected, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode.
Optionally, the allocating a corresponding feedback channel to each group includes:
a common feedback channel is allocated to each of the groups.
Optionally, the allocating a corresponding feedback channel to each group includes:
determining the priority of each user terminal in each group, wherein the priority comprises a first priority and a second priority;
allocating a feedback channel for each first priority user terminal;
and grouping the second priority user terminals in each group respectively, and distributing a common feedback channel for the second priority user terminals of each group.
Further, a preset number of feedback channels jointly occupy 1RB time-frequency domain resources, where the time-frequency domain resources include two slots, and each user terminal transmits a code division feedback signal on the slots.
Further, the performing, in real time, blind detection on the feedback channel of each group includes:
detecting in real time whether a feedback signal on a feedback channel from each of the groups is received;
and when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value, judging that the feedback signal is a data error feedback signal sent by the user terminal.
Optionally, when detecting a data error feedback signal of the user terminal, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode includes:
determining a group where a user terminal is located according to a cyclic shift value in a data error feedback signal of the user terminal;
and reducing the code rate of sending data to the group where the user terminal is located.
Optionally, when detecting a data error feedback signal of the user terminal, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode includes:
determining the priority of the user terminal according to a cyclic shift value in a data error feedback signal of the user terminal;
when the user terminal is in the first priority level, retransmitting data to the user terminal;
and when the user terminal has the second priority, reducing the code rate of sending data to the group in which the user terminal is positioned.
Through the wireless base station disclosed by the embodiment, the uplink feedback of the idle-state user terminal becomes possible, the reliability of group call service transmission can be ensured, and the spectrum utilization rate is improved.
Referring to fig. 11, the present embodiment discloses a user terminal, which includes: a second communication device 401, a second memory 402 and a second processor 403;
the second communication device 401, configured to communicate with a wireless base station;
the second memory 402 for storing a program;
the second processor 403 is configured to execute the program, and when the second processor executes the program, the uplink feedback method of the user in the group call service of the broadband trunking system applied to the user terminal disclosed in the foregoing embodiment is implemented;
the method specifically comprises the following steps:
receiving downlink data transmitted by a wireless base station;
detecting the downlink data;
and when the downlink data error is detected, sending a feedback signal in a preset format to the wireless base station on a feedback channel allocated by the wireless base station, wherein the feedback signal in the preset format comprises a front-end guard interval and a rear-end guard interval.
Further, the feedback signal in the preset format further includes a cyclic prefix and feedback data between the front-end guard interval and the back-end guard interval, the lengths of the cyclic prefix and the feedback data are two time domain symbols, the data in the cyclic prefix and the feedback data are the same, and an orthogonal sequence with a cyclic shift value mapped on each carrier is arranged.
Through the user terminal disclosed by the embodiment, the uplink feedback of the idle user terminal becomes possible, and the reliability of group call service transmission can be ensured.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. An uplink feedback method for users in group call service of broadband trunking system is applied to a wireless base station, and the method comprises the following steps:
establishing a plurality of groups, and determining the priority of each user terminal in each group, wherein the priority comprises a first priority and a second priority;
allocating a feedback channel for each first priority user terminal;
grouping the second priority user terminals in each group respectively, and allocating a common feedback channel for the second priority user terminals of each group, so that when the downlink data received by the user terminals in each group is wrong, feedback is performed through the corresponding feedback channels;
blind detection is carried out on the feedback channels of all the groups in real time;
and when a data error feedback signal of the user terminal is detected, performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode.
2. The method of claim 1, wherein a predetermined number of feedback channels jointly occupy 1RB time-frequency domain resources, wherein the time-frequency domain resources comprise two slots, and wherein each user terminal transmits a code division feedback signal on a Slot.
3. The method of claim 1, wherein the blind detection of the feedback channel of each of the groups in real time comprises:
detecting in real time whether a feedback signal on a feedback channel from each of the groups is received;
and when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value, judging that the feedback signal is a data error feedback signal sent by the user terminal.
4. The method according to claim 1, wherein when detecting a data error feedback signal of a ue, performing feedback processing on a group in which the ue is located according to a preset feedback processing mode comprises:
determining the priority of the user terminal according to a cyclic shift value in a data error feedback signal of the user terminal;
when the user terminal is in the first priority level, retransmitting data to the user terminal;
and when the user terminal has the second priority, reducing the code rate of sending data to the group in which the user terminal is positioned.
5. An uplink feedback device for users in group call service of broadband trunking system is applied to a wireless base station, and comprises:
the group establishing unit is used for establishing a plurality of groups and distributing a corresponding feedback channel for each group, so that when the downlink data received by the user terminal in each group is wrong, the feedback is carried out through the corresponding feedback channel;
the blind detection unit is used for carrying out blind detection on the feedback channels of all the groups in real time;
the feedback processing unit is used for performing feedback processing on the group where the user terminal is located according to a preset feedback processing mode when a data error feedback signal of the user terminal is detected;
the group establishing unit includes:
a first determining subunit, configured to determine priorities of user terminals in each of the groups, where the priorities include a first priority and a second priority;
the first allocating subunit is used for allocating a feedback channel to each first priority user terminal;
and the second allocating subunit is used for respectively allocating the second priority user terminals in each group and allocating a common feedback channel for the second priority user terminals of each group.
6. The apparatus of claim 5, wherein the blind detection unit comprises:
the detection subunit is used for detecting whether feedback signals from the feedback channels of the groups are received in real time;
and the judging subunit is used for judging that the feedback signal is a data error feedback signal sent by the user terminal when the power of the received feedback signal exceeds a power threshold value or the signal-to-noise ratio exceeds a signal-to-noise ratio threshold value.
7. The apparatus of claim 5, wherein the feedback processing unit comprises:
a third determining subunit, configured to determine a priority of the ue according to a cyclic shift value in a data error feedback signal of the ue;
a second processing subunit, configured to retransmit data to the user terminal when the user terminal has a first priority;
and the third processing subunit is configured to, when the user terminal has the second priority, reduce a code rate for transmitting data to a group in which the user terminal is located.
8. An uplink feedback method for users in group call service of broadband cluster system is characterized in that the method is applied to user terminals, and the method comprises the following steps:
receiving downlink data sent by a wireless base station, wherein the wireless base station is used for establishing a plurality of groups and determining the priority of each user terminal in each group, the priority comprises a first priority and a second priority, a feedback channel is respectively allocated to each first priority user terminal, the second priority user terminals in each group are respectively grouped, a common feedback channel is allocated to each second priority user terminal, and when the downlink data received by the user terminals in each group are wrong, the feedback is carried out through the corresponding feedback channels;
detecting the downlink data;
and when the downlink data error is detected, sending a feedback signal in a preset format to the wireless base station on a feedback channel allocated by the wireless base station, wherein the feedback signal in the preset format comprises a front-end guard interval and a rear-end guard interval.
9. The method of claim 8, wherein the feedback signal with the predetermined format further comprises a cyclic prefix and feedback data in a middle of the front-end guard interval and the back-end guard interval, the length of the cyclic prefix and the length of the feedback data are two time domain symbols, respectively, and the cyclic prefix and the feedback data have the same data, and are arranged with an orthogonal sequence with cyclic shift values mapped on each carrier.
10. An uplink feedback device for users in group call service of broadband trunking system is characterized in that, when applied to user terminals, the device comprises:
a receiving unit, configured to receive downlink data sent by a wireless base station, where the wireless base station is configured to establish multiple groups and determine priorities of each user terminal in each group, where the priorities include a first priority and a second priority, allocate a feedback channel to each first priority user terminal, group the second priority user terminals in each group, and allocate a common feedback channel to each second priority user terminal, so that when downlink data received by each user terminal in each group is in error, feedback is performed through the corresponding feedback channel;
a detection unit, configured to detect the downlink data;
and a feedback unit, configured to send a feedback signal in a preset format to the radio base station on a feedback channel allocated by the radio base station when the downlink data error is detected, where the feedback signal in the preset format includes a front-end guard interval and a back-end guard interval.
11. A radio base station, the radio base station comprising:
a first communication device for communicating with a user terminal;
a first memory for storing a program;
a first processor for executing the program, the first processor implementing the method of any one of 1-4 when executing the program.
12. A user terminal, the user terminal comprising:
a second communication device for communicating with the wireless base station;
a second memory for storing a program;
a second processor for executing the program, the second processor when executing the program implementing the method of any of claims 8-9.
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