WO2014158235A1 - User equipment and method for distributed channel access for d2d communications - Google Patents
User equipment and method for distributed channel access for d2d communications Download PDFInfo
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- WO2014158235A1 WO2014158235A1 PCT/US2013/068766 US2013068766W WO2014158235A1 WO 2014158235 A1 WO2014158235 A1 WO 2014158235A1 US 2013068766 W US2013068766 W US 2013068766W WO 2014158235 A1 WO2014158235 A1 WO 2014158235A1
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Classifications
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Definitions
- Embodiments pertain to wireless communications. Some embodiments relate to device-to-device (D2D) communications in wireless networks including cellular-type networks. Some embodiments relate to channel access and resource allocation in wireless networks for D2D communications. Some embodiments relate to communications between machine-to-machine (M2M) devices. Some embodiments relate to 3 GPP LTE networks.
- D2D device-to-device
- M2M machine-to-machine
- D2D communications refers to direct communications between two communication devices (e.g., user equipment (UE)). This is unlike conventional communication in a cellular-type network where communications take place between an enhanced Node B (eNB) (e.g., base station) and the communication devices.
- eNB enhanced Node B
- the eNB schedules and allocates channel resources.
- the amount of control overhead and delay associated with scheduling and allocating resources for D2D communications by the eNB may be prohibitive. This is particularly an issue in situations with a large volume of D2D
- the eNB may be unavailable for scheduling and allocating resources for D2D communications.
- FIG. 1 il lustrates a wireless network in accordance with some embodiments
- FIG. 2 illustrates distributed channel access in accordance with some embodiments
- FIGs. 3A and 3B illustrate transmission power level selection for interference avoidance in accordance with some embodiments
- FIG. 4 illustrates spatial-reuse pairing in accordance with some embodiments.
- FIG. 5 is a block diagram of a UE in accordance with some embodiments.
- FIG, 1 illustrates a wireless network in accordance with some embodiments.
- Wireless network 100 may include an eNB 106 and a plurality of 1 ] ⁇ : ⁇ . such as devices 102, 104, 108, 1 10, 112, and 114.
- Wireless network 100 may operate as a cellular network, such as a 3GPP LTE network, in which the eNB 106 schedules and allocates channel resources for communications with the UEs (i.e., for non-D2D communication).
- Some of the UEs may also be configured for D2D communications.
- device 102 and device 104 may perform D2D communication in which device 102 may communicate directly wit device 104.
- Device 1 12 and device 114 may also perform D2D communication in which device 112 may communicate directly with device 1 14.
- the UE that has data to transmit is referred to as the transmitting device while the UE that is to receive the data is referred to as the receiving device.
- a UE may be arranged to perform D2D distributed channel access for the scheduling and allocation of channel resources without invol vement of the eNB 106.
- a unique connection identifier may be associated with a one-way link between a pair of UEs (i.e., between a transmitting device and a receiving device).
- FIG, 2 illustrates distributed channel access in accordance with some embodiments.
- a UE when acting as a transmitting device (e.g., device 102 (FIG, 1 )), may be arranged to transmit a CID code 204 at a beginning of a contention window 202 to request channel access for a D2D transmission to a receiving device 104 (FIG. 1).
- the links for D2D transmissions from a transmitting device to a receiving device are identified by a CID and each CID may be mapped to a CID code 204.
- a UE when acting as a receiving device
- bandwidth grant 206 may be transmitted during the contention window 202, along with bandwidth grants for other CIDs, in an order based on a priority level of the CID.
- a UE operating as a transmitting device 102 may receive signals during the contention window 202 to identify a bandwidth grant 206 with an associated CID.
- the transmitting device 102 may transmit data 208 during the particular channel resources allocated in the bandwidth grant.
- scheduling and channel allocation for D2D communications may be performed in a distributed matter (i.e., by the UEs rather than centrally by the eNB 106). This may reduce and/or eliminate the control overhead and delay associated with conventional scheduling and channel allocation techniques performed by an eNB, such as eNB 106. For example, the use of only a CID code for a bandwidth request significantly reduces bandwidth requirements. Furthermore, overhead associated with turn-around time is reduced since the bandwidth grants 206 occur after all of the bandwidth requests (i.e., represented by CID codes 204). This is unlike some conventional techniques for contention-based scheduling in which each bandwidth grant follows an associated bandwidth request requiring overhead for turn-around time.
- a CID is associated with a one-way link between a transmitting device and a receiving device.
- a different CID may be associated with a link in the opposite direction between the same UEs.
- the CID may identify the devices and may include a device address of both the transmitting device and the receiving device, although this is not a requirement.
- the CID may comprise a shortened identifier (e.g., shorter than both device addresses) that identifies the device addresses of both the UEs (i.e., instead of a longer identifier that may include a complete device addresses of both the UEs).
- each CID may be mapped to (or associated with) a priority level.
- a UE When acting as a receiving device 104, a UE may be arranged to identify any other CID codes 204 received at the beginning of the contention window 202 and sort the received CID codes 204 based on the priority level to determine when to transmit a bandwidth grant 206. The UE may wait for transmission of any band width grants 206 associated with higher priority CIDs before transmitting its bandwidth grant 206.
- other receiving devices may also transmit bandwidth grants 206 during non-interfering portions of the contention window 202 in the order based on the priority level of their CID.
- the position of the bandwidth grant 206 for a particular transmitting device is not fixed so a transmitting device may listen to (e.g., monitor) the bandwidth grants for other transmitting devices at least until it receives its bandwidth grant. In some situations, there may not be a bandwidth grant for each transmitting device that requests a bandwidth grant.
- a UE when acting as a transmitting device 102, may be arranged to transmit a CID code 204 at a predetermined power level at the beginning of the contention window 202 to request channel access.
- the predetermined power level may be a high power level, a highest power level, or a full power level.
- the transmission of the CID code 204 at a high power level may help allow the CID code to be detected by other UEs.
- the CID code 204 is transmitted concurrently with CID codes 204 of any other transmitting devices that are also requesting channel access.
- the CID codes 204 may comprise orthogonal sequences or pseudo-orthogonal sequences and may have a low correlation with respect to each other.
- the CID codes 204 may be CDMA-like codes, although this is not a requirement as other types of codes may be used .
- a CID code 204 may be transmitted on different time-frequency resources than the CID codes transmitted by other transmitting devices that are also requesting channel access.
- the CID codes may be transmitted in different resource blocks (RBs).
- certain time-frequency resources may be designated (e.g., by an eNB 106) for D2D communications including transmission of CID codes for requesting channel access.
- a UE when acting as a receiving device 104, may monitor bandwidth grants 206 transmitted from other receiving devices having higher priority CIDs to determine remaining channel resources for allocation to an associated transmitting device. The UE may grant bandwidth to its associated transmitting device when sufficient channel resources remain and may refrain from granting band width to the associated transmitting device when insufficient channel resources remain.
- the particular channel resources available for D2D data communication may be pre-designated by an eNB 106 and known to UEs that engage in D2D communications.
- a UE when acting as a receiving device having a highest priority CID, may allocate channel resources (i.e., grant bandwidth) prior to allocation of channel resources by other receiving devices.
- channel resources i.e., grant bandwidth
- a UE may refrain from transmitting a bandwidth grant 206 when insufficient channel resources are available after allocation of channel resources by receiving devices with higher priority CIDs.
- bandwidth grants 206 may grant amounts of bandwidth that are variable in size (e.g., a variable number of resource blocks may be allocated).
- the UE may determine a recommended transmission power level for transmission of data 208 based, at least in part, on signal strengths of the CID codes 204 received from one or more transmitting devices.
- the receiving device 104 may provide the recommended transmission power level to the associated transmitting device 102 in the bandwidth grant 206.
- the data 208 may be transmitted by a transmitting device in the time-frequency resources allocated in a corresponding bandwidth grant 206.
- Data 1 may be transmitted within the time-frequency resources allocated in bandwidth (BW) Grant I
- Data 2 may be transmitted within the time-frequency resources allocated in BW Grant 2, and so forth.
- the UE may include bandwidth allocation parameters and a recommended transmission power level in a transmitted bandwidth grant 206.
- the bandwidth allocation parameters may include a starting point (or an offset value) for the resource allocation.
- the bandwidth allocation parameters may also include a resource allocation size, which may be indicated, for example, as a number of resource blocks.
- the UE may optionally include one or more of a modulation and coding scheme (MCS) and a CID of a spatial-reuse pair when spatial-reuse pairing is performed. Spatial-reuse pairing is discussed in more detail below.
- MCS modulation and coding scheme
- the bandwidth grant 206 may be arranged to grant channel resources of variable size (e.g., a variable number of RBs depending on availability). This can allow data transmissions 208 to be of variable length.
- a rejection of the bandwidth request may be transmitted and no channel resources may be granted.
- a bandwidth grant 206 with empty fields or one or more other indicators may be used as a rejection of an associated bandwidth request.
- a UE when acting as a transmitting device 102, may enter a sieep/iow-power state after being in an active state during the contention window 202 and may wake-up from the sleep/low-power state to transmit data 208 to an associated receiving device during the channel resources indicated in the bandwidth grant 206. The UE may return to the sleep/low-power state during data transmissions of any other transmitting devices.
- both a transmitting and a receiving device may be in an active state during the contention window.
- a TX-RX turn-around gap 214 may be provided between the transmitted CID codes 204 and the bandwidth grants 206. An interval between two consecutive bandwidth grants may also be provided.
- the TX-RX turn-around gap 214 and the interval between consecutive bandwidth grants may be pre-configured in each device or configured by the eNB 106.
- the TX-RX tum-around gap 214 may range from ten to twenty microseconds, for example, although this is not a requirement,
- a preamble 216 may be transmitted prior to each bandwidth grant 206.
- the size of the contention window 202 may be either fixed or dynamic. If dynamic, the contention window 202 may have a maximum size. In some embodiments in which the size of the contention window is dynamic, when the contention ends (e.g., fewer request/grants) before a maximum size is reached, the data transmission may begin almost immediately after the contention window.
- each CID may be mapped to a unique priority level so that the CIDs can be sorted based on the priority order.
- a receiving device of a link with a higher priority CID may respond sooner than a receiving device associated with a link with a lower priority CID. For example, an addressed receiving device with the highest link priority may respond to its transmitting device first.
- An addressed receiving device with a lower priority CID may wait for other receiving devices with higher priority CIDs to respond unless a higher priority receiving device asks the lower priority receiving device to respond earlier (e.g., right after the higher priority one).
- the mapping relation between a CID and priority level may be generated for fairness and/or quality of service. In some embodiments, the mapping relation may be randomized periodically to help ensure that device pairs have equal opportunity to access the channel.
- each receiving device may measure the strengths of the received signals from its associated transmitting device and the other transmitting devices for estimating an optimal transmission power for its transmitting device to send a subsequent data burst during the allocated resources. All addressed receiving devices may respond with bandwidth grants 206 one by one in the priority order. When one receiving device transmits a bandwidth grant 206, the other transmitting devices and receiving devices with lower priority CIDs may be arranged to listen to these bandwidth grant message to decide what to do.
- a default amount of resource bandwidth may be allocated or granted.
- additional bandwidth requests from the transmitting device may be piggybacked in a data packet and stored in the receiving device ' s memory for latter bandwidth grants.
- These embodiments may simplify the bandwidth request message to only a CID code because a default amount of channel resource may be granted for the initial data transmission and an additional amount of channel resource may be specified latter using an efficient modulation and/or coding scheme. If the receiving device knows about the requested bandwidth from the memory, it can grant more than the default amount of bandwidth when it receives a subsequent bandwidth request.
- each receiving device with a lower priority may remove the responded links with the highest priorities from the current priority list and may look for available resource within an entire data resource block. For example, the receiving device may calculate how much channel resource is remaining and where the resources are located. If there is enough channel resource remaining, the receiving device may continue the allocation. Otherwise, the receiving device may terminate the bandwidth grant procedure at the receiving device side. Once a receiving device has a higher priority in the aureus priority list, it gets the chance to grant the resource to its transmitting device. This chance may be overwritten by a receiving device with a higher priority. The receiving device may specify in the bandwidth grant 206 that another receiving device should take the next grant chance.
- the receiving device may also reject a request by sending a response when there is not enough resource. Since the size of the contention window 202 may be limited, the number of bandwidth grants 206 may also be limited resulting in another termination condition since any additional bandwidth grants 206 would be outside of the contention window 202,
- the transmitting device may transmit data packets in the allocated time- frequency channel resources (e.g., in the allocated resource blocks) using the specified transmit power for the specified duration.
- the other transmitting devices and receiving devices that are not allocated resources during that resource allocation may go into sleep mode to save power until their turns come up. Accordingly, devices with no data communications only need to wake up during the contention window 202 and can go to sl eep in the rest of the time. This saves power compared to conventional networks, such as a Wi-Fi network with burst contentions.
- a UE may be configured for spatial-reuse in which data, such as data 218 (Data 4) is transmitted concurrently with data 208 (Data 2) on non-orthogonal channel resources (e.g., the same or at least partially-overlapping channel resources).
- data such as data 218 (Data 4) is transmitted concurrently with data 208 (Data 2) on non-orthogonal channel resources (e.g., the same or at least partially-overlapping channel resources).
- a receiving device having a higher priority CID may identify a pair of devices with a lower priority CID as a spatial-reuse pair. For example, referring to FIG. 1, transmitting device 102 and receiving device 104 may have a higher priority CID than transmitting device 112 and receiving device 114. In these embodiments, receiving device 104 may identify transmitting device 1 12 and receiving device 1 14 as a spatial-reuse pair of devices.
- transmitting device 112 may transmit data
- the spatial-reuse data transmission i.e., data 218, may be associated with a lower priority CID and may be transmitted concurrently (i.e., in parallel) with data (e.g.. Data 2) associated with a higher priority CID on the same or partially-overlapping channel resources,
- a UE that is configured for spatial-reuse and is acting as a receiving device (e.g., receiving device 114) with a lower priority CID may be arranged to determine a recommended transmission power level (or power level limit) for a spatial-reuse data transmission (i.e., data 218).
- the spatial-reuse data transmission may be transmitted in accordance with a spatial -reuse technique by the transmitting device 1 12.
- the recommend transmission power level or limit for the spatial-reuse data transmission may be determined based on an interference estimate to help avoid interference and assure a reliable reception of the data 208 by a higher priority receiving device (e.g., receiving device 104) of the spatial- reuse pair.
- FIGs. 3 A and 3B illustrate transmission power level selection for interference avoidance in accordance with some embodiments.
- transmitting device 302 and receiving device 304 may have a higher-priority CID than transmitting device 312 and receiving device 314.
- receiving device 304 may identify transmitting device 312 and receiving device 314 as a spatial-reuse pair.
- the UE 314 may be arranged to determine a recommended transmission power level or limit for a spatial-reuse data transmission (e.g., data 218) (i.e., in accordance with a spatial-reuse technique) by the associated transmitting device 312.
- the spatial-reuse data transmission (data 218) may be transmitted concurrently with data (e.g., Data 2) of a higher priority CID (devices 302-304) on non-orthogonal channel resources.
- the recommend transmission power level for the spatial-reuse transmission may be determined by receiving device 314 based on an interference estimate to help assure a reliable reception of the data 208 by the receiving device 302 with the higher priority CID of the spatial-reuse pair.
- the receiving device 314 may estimate the path loss between the transmitting device 302 and the receiving device 304 of the higher priority CID based on the CID code and the bandwidth grant 206 transmitted by the devices having the higher-priority CID.
- the recommended transmission power level for the spatial-reuse data transmission 218 may be determined based on the estimated pat loss and an interference threshold of the receiving device 304 having the higher-priority CID.
- the receiving device 314 having the lower-priority CID may provide the recommended transmission power level in its bandwidth grant message 206 to transmitting device 312.
- an estimate of interference may be used. As shown in FIG. 3 A, there are two pairs of devices, one pair including transmitting device 302 (TX UE A) and receiving device 304 ( X UE B), and one pair including transmitting device 312 (TX UE C) and receiving device 314 (RX UE D).
- the receiving device 314 may select the transmit power for its transmitting device 312 and may indicate the power in the bandwidth allocation parameters.
- the transmit power level or limit may be selected to meet a signal-to-noise ratio (SNR) requirement plus a margin against potential interference.
- SNR signal-to-noise ratio
- the margin may be known to all devices.
- Prequire(AB) + Margin where Prequire(AB) is the required receive power level at receiver Rx B to detect modulated signal meeting specified block error rate (B ER), P(A) is the transmit power of A, and PL(AB) is the path loss between A and B that may be estimated from the measured CID and bandwidth grant signals.
- the transmitting device 312 may be arranged to avoid interference with the scheduled pairs having higher priority CIDs and may ⁇ be arranged to avoid interference with normal uplink reception by the eNB 106 (FIG. 1).
- the receiving devi ce 314 may assume a worst case scenario for selection of transmit power for the transmitting device 312. For example, as shown in FIG. 3B, receiving device Rx D computes the transmit power for its transmitting device Tx C. Since the link Tx A - Rx B has been scheduled with a higher priority, Rx D has to control Tx C's transmit power such that Tx C's interference to Rx B is below a certain threshold.
- Rx D may assume that Tx C is located between Rx B and Rx D as a worst case scenario.
- FIG, 4 illustrates spatial-reuse pairing in accordance with some embodiments.
- CID codes 404 may be transmitted at the beginning of the contention window 402 followed by bandwidth grants 406 during the contention window 402. After the contention window 402, data 408 may be transmitted.
- a UE that is configured for spatial-reuse and is acting as a receivmg device 304 may be arranged to select a pair of UEs having a lower priority CID as a spatial-reuse pair based on potential interference and provide the CID of the selected spatial-reuse pair in its bandwidth grant 206.
- the lower priority receiving device 314, in response to reception of the bandwidth grant sent by the higher priority receiving device 304 may transmit a bandwidth grant (i.e., BW Grant 3) immediately following the bandwidth grant (i.e., BW Grant 1) sent by the higher priority receivmg device 304.
- BW Grant 3 bandwidth grant
- BW Grant 3 for spatial-reuse pairing may be sent out-of-order (i.e., before BW Grant 2).
- the Iow r er priority transmitting device 312 is arranged to transmit spatial-reuse data 418 (Data 3) concurrently with data 408 (Data 1) of the higher priority transmitting device 302.
- BW Grant 1 may also include a CID of a selected spatial-reuse pair (i.e. for next receiving device for granting bandwidth).
- the higher priority receiving device 304 may select a spatial-reuse pair of UEs which is determined to have either minimal interference or a tolerable level of interference with the higher priority receiving device 304 during simultaneous transmission.
- the higher priority receiving device 304 is effectively asking the second lower priority receiving device (i.e., receiving device 314) to send a bandwidth grant (i.e., BW Grant 3) immediately after its bandwidth grant (i.e., BW grant 1 ) using a next-one indicator.
- a spatial-reuse data transmission 418 (Data 3) may have a shorter duration than data 408 (Data 1) to help avoid any impact with the data of the higher priority CID (i.e., Data 1).
- the receiving device with a higher priority CID may select a lo was-priority pair of devices with minimal interference from all candidates as a spatial-reuse pair and indicate the CID of selected device pair in the bandwidth grant message. Since the interference information is locally measured in a distributed system, there may be no central control After one link is scheduled, the receiving device on the link may have the best knowledge about which link among all links that can spatial ly reuse the channel with the scheduled one. Therefore, in some embodiments, the last scheduled receiving device may change the priority order of the other devices since the old priority order doesn't take the interferences of the already scheduled links into account.
- channel allocation for spatial-reuse may be done in a single bandwidth grant message (i.e., piggybacked) by the higher- priority receiver (i.e., to save a slot), although this is not a requirement. Because there is the CID of spatial-reuse pair, such a piggyback technique may be optional.
- the receiving device of the selected spatial- reuse pair may take the next immediate bandwidth grant slot to send its grant message.
- the receiving device that would have had that slot by default may be arranged to give up its slot or back off one slot.
- the default receiving device when it is arranged back off one slot, it may send its bandwidth grant in the next slot.
- device pair Tx3-Rx3 may be picked by the Rxl as spatial-reuse pair and may be indicated in BW Grant 1.
- Rx3 transmits its bandwidth grant (BW grant 3) immediately following bandwidth grant by Rx l (BW Grant 1) as illustrated in FIG. 4.
- Rx2 backs off one slot and transmits its bandwidth grant (BW grant 2) after BW Grant 3.
- Tx3 may transmit data (Data 3) during the same time-frequency block with Txl (Data 1).
- FIG. 5 is a block diagram of a UE in accordance with some embodiments.
- UE 500 may include physical-layer (PHY) circuitry 502, media- access control layer (MAC) circuitry 504, other processing circuitry and memory 506, as well as other components and elements.
- PHY circuitry 502 may be arranged for transmitting and receiving signals through a wireless medium using one or more antennas and MAC 1 circuitr 504 may be arranged for controlling access to the wireless medium,
- the PHY circuitry 502 and the
- the MAC circuitry 504 may be arranged to perform distributed channel access for D2D communications as described herein.
- the PHY circuitry 502 and the MAC circuitry 504 may be configured to transmit a CID code at a beginning of a contention window to request channel access for a D2D transmission to a receiving device.
- the PHY circuitry 502 and the MAC circuitry 504 may be arranged to receive a bandwidth grant from the receiving device during the contention window, along with bandwidth grants for other CIDs, in an order based on a priority level of the CID.
- the PHY circuitry 502 and the MAC circuitry 504 may be arranged to transrmt data after reception of the bandwidth grants in time-frequency resources indicated in an associated one of the bandwidth grants.
- UE 500 may be a portable wireless communication device, such as a personal digital assistant (PDA), a laptop or portable computer with wireless communication capability, a web tablet, a wireless telephone, a wireless headset, a pager, an instant messaging device, a digital camera, an access point, a television, a medical device (e.g., a heart rate monitor, a blood pressure monitor, etc.), or other device that may receive and/or transmit information wirelessly.
- the UE 500 may be a machine-to-maehine ( M2M) communication device that operates autonomously instead of a mobile device operated by a user.
- M2M machine-to-maehine
- Antennas may comprise one or more directional or
- omnidirectional antennas including, for example, dipole antennas, monopole antennas, patch antennas, loop antennas, microstrip antennas or other types of antennas suitable for transmission of RF signals.
- a single antenna with multiple apertures may be used instead of two or more antennas.
- each aperture may be considered a separate antenna.
- antennas may be effectively separated to take advantage of spatial diversity and the different channel characteristics that may result between each of antennas and the antennas of a transmitting device.
- a M2M device may utilize a single antenna.
- UE 500 may include one or more of a keyboard, a display, a non-volatile memory port, multiple antennas, a graphics processor, an application processor, speakers, and other mobile device elements.
- the display may be an LCD screen including a touch screen.
- the PHY circuitry 502 and the MAC circuitr 504 may be configured to communicate orthogonal-frequency division multiplexed (OFDM) communication signals over a multicarrier communication channel.
- the OFDM signals may comprise a plurality of orthogonal subcarriers.
- UE 500 may be a 3rd Generation Partnership Project (3GPP) Universal Terrestrial Radio Access Network (UTRAN) Long-Term-Evolution (LTE) or a Long-Term-Evolution (LTE) communication station, although the scope of the invention is not limited in this respect.
- 3GPP 3rd Generation Partnership Project
- UTRAN Universal Terrestrial Radio Access Network
- LTE Long-Term-Evolution
- LTE Long-Term-Evolution
- LTE Long-Term-Evolution
- LTE Long-Term-Evolution
- UE user Equipment
- D2D device- to-device
- PHY physical-layer
- MAC media-access control
- UE user Equipment
- PHY physical-layer
- MAC media-access control
- the UE when acting as a receiving device, is further arranged to: identif other CID codes received at the beginning of the contention window; sort the received CID codes based on the priority level to determine when to transmit a bandwidth grant; and wait for transmission of any other bandwidth grants associated with higher priority CIDs before transmitting the bandwidth grant.
- the UE when acting as a transmitting device, is arranged to transmit the CID code at a predetermined power level at the beginning of the contention window to request channel access, the
- predetermined power level determined to allow the CID code to be detected by other devices in addition to the receiving device.
- the CID code is transmitted concurrently with CID codes of other transmitting devices that are also requesting channel access.
- the CID code is transmitted on different time-frequency resources than CID codes transmitted by other transmitting devices that are also requesting channel access.
- the CID codes 204 comprise pseudo- orthogonal sequences, and the transmitting device is arranged to transmit a CID code on the same time-frequency resources as CID codes that are transmitted by other transmitting devices that are also requesting channel access,
- the UE when acting as a receiving device, is arranged to: monitor bandwidth grants transmitted from other receiving devices having higher priority CIDs to determine remaining channel resources for allocation to an associated transmitting device; grant bandwidth to the transmitting device when sufficient channel resources remain; and refrain from granting bandwidth to the transmitting device when insufficient channel resources remain.
- the UE when acting as a receiving device having a highest priority CID, allocate channel resources prior to allocation of channel resources by other receiving devices, and when acting as a receiving device and when associated with a lower priority CID, the UE is arranged to refrain from transmitting a bandwidth grant when insufficient channel resources are avai lable after allocation of channel resources by receiving devices with higher priority CIDs.
- the UE when acting as a receiving device, is arranged to determine a recommended transmission power level for transmission of data based, at least in part, on signal strengths of the CID codes received from one or more transmitting devices, and wherein the receiving device is to provide the recommended transmission power level to the associated transmitting device in a transmitted bandwidth grant.
- the UE when acting as a receiving device, is arranged to include bandwidth allocation parameters including at least one of a starting point or offset value, a resource allocation size and the recommended transmission power level in a transmitted bandwidth grant, and when spatial- reuse pairing is performed, a CID of a spatial-reuse pair and optionally bandwidth allocation parameters for the spatial-reuse pair are piggybacked in the transmitted bandwidth grant.
- the UE when acting as a transmitting device, is arranged to: enter a sleep/low-power state after the contention window; wake- up to transmit data to an associated receiving device during channel resources indicated in a bandwidth grant; and return to the sleep/low-power state during data transmissions of other transmitting devices.
- the UE is configured for spatial-reuse and is acting as a receiving device, the UE is arranged to determine a recommended transmission power level for a spatial-reuse data transmission by an associated transmitting device, wherein the spatial-reuse data transmission is transmitted concurrently with data of a higher priority CID on non-orthogonal time- frequency resources, and wherein the recommend transmission power level for the spatial-reuse transmission is determined based on an interference estimate to help assure a reliable reception of the data by a higher priority receiving device of the spatial-reuse pair.
- determining the recommended transmission power level for the spatial-reuse data transmission comprises: estimating a path loss between the transmitting device and the receivi ng de vice of the higher priority CID based on the CID code and the bandwidth grant transmitted by the devices having the higher-priority CID, and wherein the recommended transmission power level for the spatial-reuse data transmission is determined based on the estimated path loss and an interference threshold of the receiving device having the higher-priority CID.
- the receiving device when the UE is configured for spatial-reuse and is acting as a receiving device, the receiving device is arranged to: select a pair of UEs having a lower priority CID as a spatial-reuse pair based on potential interference; and provide the CID of the selected spati al-reuse pair in the bandwidth grant, wherein a lower priority receiving device, in response to reception of the bandwidth grant sent by the higher priority receiving device, is arranged to transmit a bandwidth grant immediately following the bandwidth grant sent by the higher priority receiving device, and wherein the lower priority transmitting device is arranged to transmit a spatial-reuse data transmission concurrently with data of the higher priority transmitting device,
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Abstract
Description
Claims
Priority Applications (4)
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US14/124,217 US9345046B2 (en) | 2013-03-29 | 2013-11-06 | User equipment and method for distributed channel access for D2D communications |
CN201380073622.0A CN105075370B (en) | 2013-03-29 | 2013-11-06 | The user equipment and method of distributed channel access for D2D communication |
PCT/US2013/068766 WO2014158235A1 (en) | 2013-03-29 | 2013-11-06 | User equipment and method for distributed channel access for d2d communications |
HK16105114.2A HK1217258A1 (en) | 2013-03-29 | 2016-05-04 | User equipment and method for distributed channel access for d2d communications d2d |
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US201361806821P | 2013-03-29 | 2013-03-29 | |
US61/806,821 | 2013-03-29 | ||
PCT/US2013/068766 WO2014158235A1 (en) | 2013-03-29 | 2013-11-06 | User equipment and method for distributed channel access for d2d communications |
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CN (1) | CN105075370B (en) |
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Also Published As
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CN105075370A (en) | 2015-11-18 |
CN105075370B (en) | 2018-12-21 |
US20140295858A1 (en) | 2014-10-02 |
US9345046B2 (en) | 2016-05-17 |
HK1217258A1 (en) | 2016-12-30 |
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