Signal retransmission apparatus and method and communication system
Embodiments of the present disclosure provide a signal retransmission apparatus and method and a communication system. The method includes: a first UE determines a resource for retransmitting a signal according to a resource for initially transmitting the signal and a frequency hopping pattern; and retransmits the signal to a second UE according to the determined resource. With the embodiments of the present disclosure, interference between UEs may be randomized as possible, and complexity of blind detection by receiver end UE may be lowered as possible.
1. A signal transmission apparatus the apparatus, configured in a first User Equipment (UE), comprising:
a resource determining unit configured to determine, when a first UE repeatedly transmits a signal a given number of times to perform Device-to-Device (D2D) communications or D2D discovery with a second UE, a resource for transmitting the signal in a second and subsequent times within the given number of times according to a randomly selected resource for transmitting the signal in a first time within the given number of times and a frequency hopping pattern;
a signal transmitting unit configured to transmit the signal to the second UE according to the determined resource; and
a configuration receiving unit configured to:
receive configuration information for configuring the resource for transmitting the signal in the first time transmitted by a base station in a case where the first UE and the second UE perform D2D communications, or
receive configuration information for configuring the resource for transmitting the signal in the first time transmitted semi-statically or dynamically by the base station in a case where the first UE and the second UE perform D2D discovery, wherein the frequency hopping pattern is cell-specific or common.
2. The signal transmission apparatus according to claim 1 , wherein for a plurality of the first UEs performing D2D communications by using different modes, the frequency hopping patterns are different; or for a plurality of the first UEs performing D2D discovery by using different types, the frequency hopping patterns are different.
3. The signal transmission apparatus according to claim 1 , wherein the frequency hopping pattern is related to one or more pieces of the following information: information on a location of the resource for transmitting the signal in the first time, identification information on a UE transmitting the signal, and information on a location of a subframe for transmitting the signal.
4. The signal transmission apparatus according to claim 1 , wherein the frequency hopping pattern is UE-specific.
5. The signal transmission apparatus according to claim 1 , wherein
the resource determining unit is further configured to
select randomly a resource for transmitting a signal in the first time in a case where the first UE and the second UE perform D2D communications, or
select randomly a resource for transmitting a signal in the first time from a predetermined resource pool in a case where the first UE and the second UE perform D2D discovery.
6. A signal transmission apparatus, configured in a first User Equipment (UE), the apparatus comprising:
a resource determining unit configured to determine, when the first UE repeatedly transmits a signal a given number of times to perform Device-to-Device (D2D) communications or D2D discovery with a second User Equipment (UE), a resource for transmitting the signal in a second and subsequent times within the given number of times according to a randomly selected resource for transmitting the signal in a first time within the given number of times and a frequency hopping pattern; and
a signal transmitting unit configured to transmit the signal to the second UE according to the determined resource, wherein
for the first UE performing D2D communications by using a mode 1, the frequency hopping pattern adopts a Physical Uplink Shared Chanel (PUSCH) hopping type 1, or adopts a PUSCH hopping type 2 and the frequency hopping pattern is cell-specific or common;
and for the first UE performing D2D communications by using a mode 2, the frequency hopping pattern adopts a PUSCH hopping type 2 and the frequency hopping pattern is UE-specific.
7. A signal transmission apparatus, configured in a first User Equipment (UE), the apparatus comprising:
a resource determining unit configured to determine, when the first UE repeatedly transmits a signal a given number of times to perform Device-to-Device (D2D) communications or D2D discovery with a second User Equipment (UE), a resource for transmitting the signal in a second and subsequent times within the given number of times according to a randomly selected resource for transmitting the signal in a first time within the given number of times and a frequency hopping pattern;
a signal transmitting unit configured to transmit the signal to the second UE according to the determined resource; and
an information transmitting unit configured to transmit indication information for determining a transmission resource to the second UE, so that the second UE receives the transmitted signal according to the indication information,
wherein the indication information for determining a transmission resource comprises: information on a location of a resource for transmitting the signal in the first time; identification information on a UE transmitting the signal; and information on a location of a subframe for transmitting the signal.
8. The signal transmission apparatus according to claim 7 , wherein the indication information for determining a transmission resource is carried in scheduling assignment information when the first UE and the second UE perform D2D communications,
or the indication information for determining a transmission resource is carried in discovery preamble information when the first UE and the second UE perform D2D discovery.
9. A signal transmission apparatus, configured in a second User Equipment (UE), the apparatus comprising:
a signal receiver configured to receive, when a first User Equipment (UE) repeatedly transmits a signal a given number of times to perform Device-to-Device (D2D) communications or D2D discovery with the second UE, the signal transmitted by the first UE, wherein
a resource for transmitting the signal in a second and subsequent times within the given number of times is determined by the first UE according to a randomly selected resource for transmitting the signal in a first time within the given number of times and a frequency hopping pattern; and
an information receiving unit configured to receive indication information for determining a transmission resource transmitted by the first UE, so that the signal receiver is configured to receive the transmitting signal according to the indication information,
wherein
the indication information for determining a transmission resource is carried in scheduling assignment information when the first UE and the second UE perform D2D communications,
or the indication information for determining a transmission resource is carried in discovery preamble information when the first UE and the second UE perform D2D discovery.
10. The signal transmission apparatus according to claim 9 , wherein the indication information for determining a transmission resource comprises: information on a location of a resource for transmitting the signal in the first time, identification information on a UE transmitting the signal, and information on a location of a subframe for transmitting the signal.
11. The signal transmission apparatus according to claim 9 , wherein the receiver is configured to obtain information on a location of the resource where the signal is located by detecting Demodulation Reference Signal (DMRS) sequences, and receive the transmitted signal according to the information on a location.
12. The signal transmission apparatus according to claim 9 , wherein the apparatus further comprises:
a signal processing unit configured to perform reception and combination processing on the received signals.
13. A communication system, comprising:
a first User Equipment (UE); and
a second UE, wherein:
the first UE is configured to determine, when the first UE repeatedly transmits a signal a given number of times to perform Device-to-Device (D2D) communications or D2D discovery with the second UE, a resource for transmitting the signal in a second and subsequent times within the given number of times according to a randomly selected resource for transmitting the signal in a first time within the given number of times and a frequency hopping pattern and is configured to transmit the signal according to the determined resource; and
a base station configured to configure the first UE with a resource for transmitting a signal in the first time in a case where the first UE and the second UE perform D2D communications, or configure semi-statically or dynamically the first UE with a resource for transmitting a signal in the first time in a case where the first UE and the second UE perform D2D discovery.