Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/12—Wireless traffic scheduling
  • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/003—Arrangements for allocating sub-channels of the transmission path
  • H04L5/0044—Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L5/00—Arrangements affording multiple use of the transmission path
  • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04W—WIRELESS COMMUNICATION NETWORKS
  • H04W72/00—Local resource management
  • H04W72/50—Allocation or scheduling criteria for wireless resources
  • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
  • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality

Definitions

• Data may be divided into logical channels, transport channels, and physical layer channels. Channels may also be classified into Control Channels and Traffic Channels.
• Logical control channels may include paging control channel (PCCH) for paging information, broadcast control channel (BCCH) for broadcast system control information, multicast control channel (MCCH) for transmitting multimedia broadcast multicast service (MBMS) scheduling and control information, dedicated control channel (DCCH) for transmitting dedicated control information, common control channel (CCCH) for random access information, dedicated traffic channel (DTCH) for dedicated UE data, and multicast traffic channel (MTCH), for multicast data.
• PCCH paging control channel
• BCCH broadcast control channel
• MCCH multicast control channel
• DCCH dedicated control channel
• CCCH common control channel
• DTCH dedicated traffic channel
• MTCH multicast traffic channel
• PDCCH can carry DCI messages associated with multiple users, and each UE 1 15 may decode the DCI messages that are intended for it.
• each UE 115 may be assigned a cell radio network temporary identity (C-RNTI) and CRC bits attached to each DCI may be scrambled based on the C-RNTI.
• C-RNTI cell radio network temporary identity
• CRC bits attached to each DCI may be scrambled based on the C-RNTI.
• CCE control channel element
• CCEs may be grouped (e.g., in groups of 1, 2, 4 and 8 CCEs), and a set of CCE locations in which the user equipment may find relevant DCI may be specified. These CCEs may be known as a search space.
• the search space can be partitioned into two regions: a common CCE region or search space and a UE-specific (dedicated) CCE region or search space.
• the common CCE region is monitored by all UEs served by a base station 105 and may include information such as paging information, system information, random access procedures, and the like.
• the UE-specific search space may include user-specific control information.
• a UE 1 15 may attempt to decode DCI by performing a process known as a blind decode, during which search spaces are randomly decoded until the DCI is detected.
• HARQ may be a method of ensuring that data is received correctly over a wireless communication link 125.
• the subframe may be the smallest scheduling unit, also known as a transmission time interval (TTI).
• TTI transmission time interval
• a TTI may be shorter than a subframe or may be dynamically selected (e.g., in short TTI bursts or in selected component carriers using short TTIs). For example, some TTIs may have a duration of one or a few symbol periods.
• the wireless communication system 100 may use 1ms transmit time intervals (TTIs) (i.e., a subframe) for sending and receiving data during a non-low latency communication.
• TTIs transmit time intervals
• a set of resource may be allocated to a transmitting base station 105 or UE 115 for a TTI. During this time a transmission from the transmitting device may occupy those resources.
• wireless communication system 200-a and wireless communication system 200-b illustrate examples in which a UE 1 15 receives a low latency indicator from a base station 105
• a base station 105 may also receive a low latency from a neighbor base station 105 via backhaul link to coordinate interference mitigation operations.
• Base station 105-b may then include the low latency indicator with a subsequent downlink grant associated with a subsequent non-low latency transmission to UE 1 15-c.
• a neighboring base station 105 may directly transmit an indication, which may be particularly useful if the indication is for handling symbol or block-dependent low latency interference from neighboring cells because backhaul information can be minimized.
• a UE 115 may receive an indicator in control channel 312 and may cancel scheduled transmissions based on the indictor.
• An indicator in control channel 312 may cancel transmissions within individual symbols, sets of symbols, for a subframe, for sets of subframes, or the like.
• a UE 115 scheduled for PDSCH 320 may detect control channel 312 in symbol 5 of slot 0 or a subframe, and the symbol 5 PDSCH transmission may be canceled, while the PDSCH transmission for remaining symbols may be valid.
• a UE 115 scheduled for PDSCH 320 may detect control channel 312, which may indicate that the PDSCH transmission is canceled for a number of symbols (e.g., all symbols following control channel 312 within data region 310-a).
• a UE 115 may monitor a control region 305 or control channel 312 for an indication of whether a TB is repeated.
• Such repetition of TBs may be employed to provide additional systematic bits or redundancy bits, or both, or to provide simple repetition of code blocks transmitted within a subframe. For instance, for a two code-block transmission, half of the resources of a symbol may be allocated for one of the code blocks and the other half of the resources may be allocated to the other. Then, this configuration may be repeated for each symbol of a subframe.
• Low latency transmissions 315 may be transmitted by a UE 1 15 or base station 105 located in the same serving cell as the scheduled PDSCH 320.
• the serving base station 105 may transmit the indicator at the end of first data region 310-a or during subsequent control region 305-b or in control channel 312.
• the low latency transmissions 3 15 are transmitted by a UE 1 15 or base station 105 in a neighboring cell.
• the neighboring base station 105 may transmit a broadcast message indicating low latency operation (or send a backhaul indication to the serving cell).
• FIG. 4A illustrates an example of a process flow 400-a for parallel low latency awareness in accordance with various aspects of the present disclosure.
• Process flow 400-a may include UE 115-e, UE 115-f, and base station 105-d, which may be examples of a UE 115 or base station 105 described with reference to FIGs. 1-2.
• base station 105-d, UE 115-e, UE 115-f may utilize low latency indicators to facilitate the decoding of data.
• FIG. 4B illustrates an example of a process flow 400-b for parallel low latency awareness in accordance with various aspects of the present disclosure.
• Process flow 400-b may include UE 1 15-g, UE 115-h, base station 105-e, and base station 105-f, which may be examples of a UE 115 or base station 105 described with reference to FIGs. 1 -2.
• base station 105-e, base station 105-f, UE 115-e, and UE 115-f may utilize low latency indicators to facilitate the decoding of data.
• the low latency indication module 610 may receive an indication that a low latency transmission is present in a portion of the data region within the first TTI, and the low latency transmission may be based on a second TTI as described with reference to FIGs. 2-4. In some examples, the indication may be received subsequent to the second TTI. In some examples, the indication may be received subsequent to the first TTI.
• the low latency transmission may be directed toward a different wireless device. In some examples, the low latency transmission may be from a same cell as the data channel. In some examples, the low latency transmission is from a different cell than the data channel. In some cases, the indication may be received via a base station backhaul link.
• the second TTI may, for example, be an LTE symbol period.
• the base station communication module 925 may manage communications with other base stations 105.
• the communications management module may include a controller or scheduler for controlling communications with UEs 115 in cooperation with other base stations 105.
• the base station communication module 925 may coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques such as beamforming or joint transmission.
• the device may receive a data channel during a first TTI utilizing resources in a data region as described with reference to FIGs. 2-4.
• the indication is received subsequent to the second TTI.
• the operations of block 1510 may be performed by the data module 605 as described with reference to FIG. 6 in conjunction with a transceiver such as illustrated by transceiver 835 or 935 described with reference to FIGs. 8 and 9.

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• Engineering & Computer Science (AREA)
• Signal Processing (AREA)
• Computer Networks & Wireless Communication (AREA)
• Quality & Reliability (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2016
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• 2018
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