METHODS, APPARATUS AND COMPUTER PROGRAMS FOR CONTROLLING RETRANSMISSIONS OF WIRELESS SIGNALS
A wireless device operates in a wireless cellular network under control of a network control apparatus. The wireless device transmits a signal to the network control apparatus. The wireless device receives from the network control apparatus a negative acknowledgement of receipt of the signal in accordance with an automatic repeat request process, The negative acknowledgement indicates that the signal was not received or was not received correctly by the network control apparatus. The wireless device either does not retransmit the signal to the network control apparatus or delays the retransmission of the signal to the network control apparatus in order to avoid conflict with a device-to-device discovery signal being sent by another wireless device.
1 . A method of operating a wireless device in a wireless cellular network under control of a network control apparatus, the method comprising:
the wireless device transmitting a signal to the network control apparatus; and
the wireless device receiving from the network control apparatus a negative acknowledgement of receipt of the signal in accordance with an automatic repeat request process, the negative acknowledgement indicating that the signal was not received or was not received correctly by the network control apparatus;
the wireless device either not retransmitting the signal to the network control apparatus or delaying the retransmission of the signal to the network control apparatus in order to avoid conflict with a device-to-device discovery signal being sent by another wireless device.
2 . The method according to claim 1 , wherein the wireless device delays the retransmission of the signal to the network control apparatus to occur later than the sending of the device-to-device discovery signal being sent by the other wireless device by one round trip time of the automatic repeat request process.
3 . The method according to claim 1 , wherein the wireless device autonomously delays the retransmission of the signal to the network control apparatus.
4 . The method according to claim 3 , wherein the wireless device retransmits the signal to the network control apparatus in response to receiving from the network control apparatus a further negative acknowledgement of receipt of the signal.
5 . The method according to claim 3 , wherein the wireless device is inhibited from delaying the retransmission of another signal to the network control apparatus within a predetermined period of time from autonomously delaying the retransmission of the first signal.
6 . The method according to claim 1 , wherein the wireless device delays the retransmission of the signal to the network control apparatus by a new automatic repeat request process number being assigned for the retransmission of the signal to the network control apparatus, the new automatic repeat request process number being different from the automatic repeat request process number of the negative acknowledgement of receipt of the signal originally received from the network control apparatus.
7 . The method according to claim 6 , wherein the new automatic repeat request process number assigned for the retransmission of the signal to the network control. apparatus is such that the retransmission of the signal to the network control apparatus takes place after the device-to-device discovery signal being sent by another wireless device.
8 . The method according to claim 6 , wherein the new automatic repeat request process number is allocated from at least one of another serving cell and another component carrier of the wireless device.
9 . The method according to claim 1 , wherein the wireless device comprises an automatic repeat request buffer, the wireless device flushing the corresponding automatic repeat request process from the automatic repeat request buffer so as not to retransmit the signal to the network control apparatus.
10 . The method according to claim 1 , wherein the wireless device assumes that the maximum number of transmissions of the corresponding automatic repeat request process has been reached so as not to retransmit the signal to the network control apparatus.
11 . An apparatus for a wireless device, the apparatus comprising:
at least one processor;
and at least one memory including computer program code;
the at least one memory and the computer program code being configured to, with the at least one processor, cause the wireless device to:
transmit a signal to a network control apparatus that controls a wireless cellular network that provides service for the wireless device; and
following receipt by the wireless device from said network control apparatus of a negative acknowledgement of receipt of the signal in accordance with an automatic repeat request process, the negative acknowledgement indicating that the signal was not received or was not received correctly by said network control apparatus, the wireless device either not retransmitting the signal to said network control apparatus or delaying the retransmission of the signal to said network control apparatus in order to avoid conflict with a device-to-device discovery signal being sent by another wireless device.
12 . The apparatus according to claim 11 , wherein the apparatus is arranged to delay the retransmission of the signal to said network control apparatus to occur later than the sending of the device-to-device discovery, signal being sent by the other wireless device by one round trip time of the automatic repeat request process.
13 . The apparatus according to claim 11 , wherein the apparatus is arranged such that the wireless device autonomously delays the retransmission of the signal to said network control apparatus.
14 . The apparatus according to claim 13 , wherein the apparatus is arranged such that the wireless device retransmits the signal to said network control apparatus in response to receiving from said network control apparatus a further negative, acknowledgement of receipt of the signal.
15 . The apparatus according to claim 13 , wherein the apparatus is arranged such that the wireless device is inhibited from delaying the retransmission of another signal to said network control apparatus within a predetermined period of time from autonomously delaying the retransmission of the first signal.
16 . The apparatus according to claim 11 , wherein the apparatus is arranged such that the wireless device delays the retransmission of the signal to said network control apparatus by a new automatic repeat request process number being assigned for the retransmission of the signal to said network control apparatus, the new automatic repeat request process number being different from the automatic repeat request process number of the negative acknowledgement of receipt of the signal originally received from said network Control apparatus.
17 . The apparatus according to claim 16 , wherein the new automatic repeat request process number assigned for the retransmission of the signal to said network control apparatus is such that the retransmission of the signal to said network control apparatus takes place after the device-to-device discovery signal being sent by another wireless device.
18 . The apparatus according to claim 16 , wherein the new automatic repeat request process number is allocated from at least one of another serving cell and another component carrier of the wireless device.
19 . The apparatus according to claim 11 , wherein the apparatus is arranged to flush the corresponding automatic repeat request process from an automatic repeat request buffer of the wireless device so as not to retransmit the signal to said network control apparatus.
20 . The apparatus according to claim 11 , wherein the apparatus is arranged such that the wireless device assumes that the maximum number of transmissions of the corresponding automatic repeat request process has been readied so as not to retransmit the signal to said network control apparatus.
21 . A method of operating a network control apparatus that controls a wireless device served by a wireless cellular network under control of the network control apparatus, the method comprising:
the network control apparatus transmitting a negative acknowledgement of receipt of a signal sent by the wireless device in accordance with an automatic repeat request process, the negative acknowledgement indicating that the signal was not received or was not received correctly by the network control apparatus; and
the network control apparatus assigning a new automatic repeat request process number for a retransmission of the signal by the wireless device to the network control apparatus, the new automatic repeat request process number being different from the automatic repeat request process number of the negative acknowledgement of receipt of the signal sent by the network control apparatus, thereby to avoid said retransmission conflicting with a device-to-device discovery signal being sent by another wireless device.
22 . An apparatus for a network control apparatus that controls a wireless cellular network, the apparatus comprising:
at least one processor;
and at least one memory including computer program code;
the at least one memory and the computer program code being configured to, with the at least one processor, cause the network control apparatus to:
transmit a negative acknowledgement of receipt of a signal sent by a wireless device in accordance with an automatic repeat request process, the negative acknowledgement indicating that the signal was not received or was not received correctly by the network control apparatus; and
assign a new automatic repeat request process number for a retransmission of the signal by the wireless device to the network control apparatus, the new automatic repeat request process number being different from the automatic repeat request process number of the negative acknowledgement of receipt of the signal sent by the network control apparatus, thereby to avoid said retransmission conflicting with a device-to-device discovery signal being sent by another wireless device.