# US 2019/0357232 A1 · Dynamic uplink reuse in a c-ran

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- Number: US 2019/0357232 A1
- Document ID: US20190357232A1
- Status: Published application
- Kind: A1
- Application number: 16/413,360
- Filed: 2019-05-15
- Published: 2019-11-21
- Earliest claimed: 2018-05-16
- Assignees: CommScope Technologies LLC
- Applicants: CommScope Technologies LLC
- Inventors: Balaji B Raghothaman; Stuart D. Sandberg; Kompella Purnima; Anil Bapat
- Web page: https://patentgrep.com/patent/US20190357232A1

## CPC

- H04L 5/0037: {Inter-user or inter-terminal allocation}
- H04W 72/121: for groups of terminals or users
- H04B 17/336: Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)}
- H04L 5/0062: {Avoidance of ingress interference, e.g. ham radio channels}
- H04W 52/08: Closed loop power control
- H04W 52/146: {Uplink power control}
- H04W 52/24: using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W 52/241: {taking into account channel quality metrics, e.g. SIR, SNR, CIR or Eb/lo}
- H04W 52/243: {taking into account interferences}
- H04W 52/365: {Power headroom reporting}
- H04W 72/1268: of uplink data flows
- H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04W 52/242: {taking into account path loss}
- H04W 52/245: {taking into account received signal strength}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04B: TRANSMISSION

## Abstract

This disclosure is directed to techniques for implementing uplink spatial reuse in a C-RAN.

## Claims

### Claim 1

A system to provide wireless service comprising:
a controller; and
a plurality of radio points;
wherein each of the radio points is associated with at least one antenna and remotely located from the controller, wherein the plurality of radio points is communicatively coupled to the controller;
wherein the controller and the plurality of radio points are configured to implement a base station in order to provide wireless service to a plurality of user equipment (UEs) using a cell;
wherein the controller is communicatively coupled to a core network of a wireless service provider;
wherein the controller is configured to implement a scheduler to schedule uplink transmissions from the UEs;
wherein the controller is configured to implement a combining receiver to receive uplink transmissions from each UE, the combining receiver configured to combine data indicative of the uplink transmissions from each UE as received at each radio point included in a combining zone assigned to that UE and communicated to the controller;
wherein the controller is configured to assign, to each UE, a respective minimum combining zone comprising a respective minimum subset of the radio points for use as the combining zone of the combining receiver for receiving uplink transmission from that UE;
wherein the controller is configured to assign, to each UE, a respective signal zone comprising a respective subset of the radio points that can be included in the combining zone of the combining receiver for receiving uplink transmission from that UE;
wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during a respective same time-and-frequency resource based on the respective minimum combining zones and signal zones assigned to the UEs and allocate time-and-frequency resources to the UEs using the minimum combining zones assigned to the UEs; and
wherein the scheduler is configured to, after allocating time-and-frequency resources to the UEs, attempt to expand the combining zones used for receiving uplink transmissions.

### Claim 2 (depends on 1)

The system of claim 1, wherein the controller is configured to assign to each UE a respective interference zone comprising a respective subset of the radio points that cannot be included in the combining zone of the combining receiver for receiving uplink transmission from that UE.

### Claim 3 (depends on 2)

The system of claim 2, wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during the same time-and-frequency resource based on the respective minimum combining zones assigned to the UEs by:
determining if the minimum combining zone of a first UE does not include any radio points that are in the signal zone of a second UE and if the minimum combining zone of the second UE does not include any radio points that are in the signal zone of the first UE.

### Claim 4 (depends on 2)

The system of claim 2, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for any multiple UEs that are scheduled to make respective uplink transmissions during the same time-and-frequency resource by expanding the combining zone of a first of the multiple UEs to include one or more additional radio points.

### Claim 5 (depends on 4)

The system of claim 4, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for the multiple UEs by expanding the combining zone of the first of the multiple UEs to include any radio point in the minimum combining zone of a second of the multiple UEs that is in the signal zone of the first of the multiple UEs.

### Claim 6 (depends on 2)

The system of claim 2, wherein the controller is configured to assign the respective signal zone for each UE as a function of an ability of including each radio point in the respective combining zone of that UE to benefit the receiving of uplink transmissions from that UE.

### Claim 7 (depends on 1)

The system of claim 1, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for a transmission time interval (TTI) by expanding the combining zone of one or more of the UEs if less than a total front-haul capacity for communicating data between the one or more radio points and the controller is not being used for the TTI.

### Claim 8 (depends on 1)

The system of claim 1, wherein the controller is communicatively coupled to the radio points using a switched ETHERNET network.

### Claim 9 (depends on 1)

The system of claim 1, wherein the uplink transmissions comprise Physical Uplink Shared Channel (PUSCH) transmissions.

### Claim 10 (depends on 1)

The system of claim 1, wherein the scheduler is configured to, for any multiple UEs that are scheduled to make respective uplink transmissions during the same time-and-frequency resource, assign respective UE-specific demodulation reference signal (DM-RS) cyclic shifts to the multiple UEs, each of the UE-specific DM-RS cyclic shifts having an associated distance between that UE-specific DM-RS cyclic shift and each of the other UE-specific DM-RS cyclic shifts, wherein the DM-RS cyclic shifts are assigned to maximize the respective distances.

### Claim 11 (depends on 1)

The system of claim 1, wherein the controller is configured to perform transmit power control for the uplink transmissions from the UEs using a closed-loop UE-specific target SINR that is adapted for each UE based on a power headroom reported for that UE.

### Claim 12 (depends on 1)

The system of claim 1, wherein the controller is configured to perform transmit power control for the uplink transmissions from the UEs using a closed-loop UE-specific measured SINR that uses: a signal power measurement based on uplink transmissions from that UE; and an interference-plus-noise measurement based on uplink transmissions from all scheduled UEs.

### Claim 13 (depends on 1)

The system of claim 1, wherein the controller is configured to perform transmit power control for a UE as a function of external interference caused by the uplink transmissions from that UE and of internal interference caused by uplink transmission from that UE.

### Claim 14 (depends on 1)

The system of claim 1, wherein the scheduler is configured to perform link adaptation for uplink transmissions from the UEs by selecting a modulation and coding scheme (MCS) for each UE based on a measured signal-to-interference-plus-noise ratio (SINR) for the UE and a sequence of acknowledgement and negative acknowledgement (ACK/NACK) messages associated with the uplink transmissions from the UE.

### Claim 15

A system to provide wireless service comprising:
a controller; and
a plurality of radio points;
wherein each of the radio points is associated with at least one antenna and remotely located from the controller, wherein the plurality of radio points is communicatively coupled to the controller;
wherein the controller and the plurality of radio points are configured to implement a base station in order to provide wireless service to a plurality of user equipment (UEs) using a cell;
wherein the controller is communicatively coupled to a core network of a wireless service provider;
wherein the controller is configured to implement a scheduler to schedule uplink transmissions from the UEs;
wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during a respective same time-and-frequency resource, and, for any multiple UEs that are able to make respective uplink transmissions during the respective same time-and-frequency resource, schedule said multiple UEs to make respective uplink transmissions during the respective same time-and-frequency resource and assign respective UE-specific demodulation reference signal (DM-RS) cyclic shifts to said multiple UEs; and
wherein each of the UE-specific DM-RS cyclic shifts have an associated distance between that UE-specific DM-RS cyclic shift and each of the other UE-specific DM-RS cyclic shifts, wherein the DM-RS cyclic shifts are assigned to maximize the respective distances.

### Claim 16 (depends on 15)

The system of claim 15, wherein the controller is configured to implement a combining receiver to receive the uplink transmissions from each UE, the combining receiver configured to combine data indicative of the uplink transmissions from each UE as received at each radio point included in a combining zone assigned to that UE and communicated to the controller;
wherein the controller is configured to assign, to each UE, a respective minimum combining zone comprising a respective minimum subset of the radio points for use as the combining zone of the combining receiver for receiving uplink transmissions from that UE;
wherein the controller is configured to assign, to each UE, a respective signal zone comprising a respective subset of the radio points that can be included in the combining zone of the combining receiver for receiving uplink transmission from that UE;
wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during a respective same time-and-frequency resource based on the respective minimum combining zones and signal zones assigned to the UEs;
wherein the scheduler is configured to allocate time-and-frequency resources to the UEs using the minimum combining zones assigned to the UEs; and
wherein the scheduler is configured to, after allocating time-and-frequency resources to the UEs, attempt to expand the combining zones used for receiving uplink transmissions.

### Claim 17 (depends on 16)

The system of claim 16, wherein the controller is configured to assign to each UE a respective interference zone comprising a respective subset of the radio points that cannot be included in the combining zone of the combining receiver for receiving uplink transmission from that UE.

### Claim 18 (depends on 17)

The system of claim 17, wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during the same time-and-frequency resource based on the respective minimum combining zones assigned to the UEs by:
determining if the minimum combining zone of a first UE does not include any radio points that are in the signal zone of a second UE and if the minimum combining zone of the second UE does not include any radio points that are in the signal zone of the first UE.

### Claim 19 (depends on 17)

The system of claim 17, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for any multiple UEs that are scheduled to make respective uplink transmissions during the same time-and-frequency resource by expanding the combining zone of a first of the multiple UEs to include one or more additional radio points.

### Claim 20 (depends on 19)

The system of claim 19, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for the multiple UEs by expanding the combining zone of the first of the multiple UEs to include any radio point in the minimum combining zone of a second of the multiple UEs that is in the signal zone of the first of the multiple UEs.

### Claim 21 (depends on 17)

The system of claim 17, wherein the controller is configured to assign the respective signal zone for each UE as a function of an ability of including each radio point in the respective combining zone of that UE to benefit the receiving of uplink transmissions from that UE.

### Claim 22 (depends on 16)

The system of claim 16, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for a transmission time interval (TTI) by expanding the combining zone of one or more of the UEs if less than a total front-haul capacity for communicating data between the one or more radio points and the controller is not being used for the TTI.

### Claim 23 (depends on 15)

The system of claim 15, wherein the controller is communicatively coupled to the radio points using a switched ETHERNET network.

### Claim 24 (depends on 15)

The system of claim 15, wherein the uplink transmissions comprise Physical Uplink Shared Channel (PUSCH) transmissions.

### Claim 25 (depends on 15)

The system of claim 15, wherein the controller is configured to perform transmit power control for the uplink transmissions from the UEs using a closed-loop UE-specific target SINR that is adapted for each UE based on a power headroom reported for that UE.

### Claim 26 (depends on 15)

The system of claim 15, wherein the controller is configured to perform transmit power control for the uplink transmissions from the UEs using a closed-loop UE-specific measured SINR that uses: a signal power measurement based on uplink transmissions from that UE; and an interference-plus-noise measurement based on uplink transmissions from all scheduled UEs.

### Claim 27 (depends on 15)

The system of claim 15, wherein the controller is configured to perform transmit power control for a UE as a function of external interference caused by the uplink transmissions from that UE and of internal interference caused by uplink transmission from that UE.

### Claim 28 (depends on 15)

The system of claim 15, wherein the scheduler is configured to perform link adaptation for uplink transmissions from the UEs by selecting a modulation and coding scheme (MCS) for each UE based on a measured signal-to-interference-plus-noise ratio (SINR) for the UE and a sequence of acknowledgement and negative acknowledgement (ACK/NACK) messages associated with the uplink transmissions from the UE.

### Claim 29

A system to provide wireless service comprising:
a controller; and
a plurality of radio points;
wherein each of the radio points is associated with at least one antenna and remotely located from the controller, wherein the plurality of radio points is communicatively coupled to the controller;
wherein the controller and the plurality of radio points are configured to implement a base station in order to provide wireless service to a plurality of user equipment (UEs) using a cell;
wherein the controller is communicatively coupled to a core network of a wireless service provider;
wherein the controller is configured to implement a scheduler to schedule uplink transmissions from the UEs;
wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during a respective same time-and-frequency resource, and, for any multiple UEs that are able to make respective uplink transmissions during the respective same time-and-frequency resource, schedule said multiple UEs to make respective uplink transmissions during the respective same time-and-frequency resource; and
wherein the controller is configured to perform transmit power control for the uplink transmissions from the UEs using at least one of the following:
a closed-loop UE-specific target SINR that is adapted for each UE based on a power headroom reported for that UE; and
a closed-loop UE-specific measured SINK that uses: a signal power measurement based on uplink transmissions from that UE, and an interference-plus-noise measurement based on uplink transmissions from all scheduled UEs.

### Claim 30 (depends on 29)

The system of claim 29, wherein the controller is configured to perform transmit power control for a UE as a function of external interference caused by the uplink transmissions from that UE and of internal interference caused by uplink transmission from that UE.

### Claim 31 (depends on 29)

The system of claim 29, wherein the controller is configured to implement a combining receiver to receive the uplink transmissions from each UE, the combining receiver configured to combine data indicative of the uplink transmissions from each UE as received at each radio point included in a combining zone assigned to that UE and communicated to the controller;
wherein the controller is configured to assign, to each UE, a respective minimum combining zone comprising a respective minimum subset of the radio points for use as the combining zone of the combining receiver for receiving uplink transmission from that UE;
wherein the controller is configured to assign, to each UE, a respective signal zone comprising a respective subset of the radio points that can be included in the combining zone of the combining receiver for receiving uplink transmission from that UE;
wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during a respective same time-and-frequency resource based on the respective minimum combining zones and signal zones assigned to the UEs;
wherein the scheduler is configured to allocate time-and-frequency resources to the UEs using the minimum combining zones assigned to the UEs; and
wherein the scheduler is configured to, after allocating time-and-frequency resources to the UEs, attempt to expand the combining zones used for receiving uplink transmissions.

### Claim 32 (depends on 31)

The system of claim 31, wherein the controller is configured to assign to each UE a respective interference zone comprising a respective subset of the radio points that cannot be included in the combining zone of the combining receiver for receiving uplink transmission from that UE.

### Claim 33 (depends on 32)

The system of claim 32, wherein the scheduler is configured to determine if multiple UEs are able to make respective uplink transmissions during the same time-and-frequency resource based on the respective minimum combining zones assigned to the UEs by:
determining if the minimum combining zone of a first UE does not include any radio points that are in the signal zone of a second UE and if the minimum combining zone of the second UE does not include any radio points that are in the signal zone of the first UE.

### Claim 34 (depends on 32)

The system of claim 32, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for any multiple UEs that are scheduled to make respective uplink transmissions during the same time-and-frequency resource by expanding the combining zone of a first of the multiple UEs to include one or more additional radio points.

### Claim 35 (depends on 34)

The system of claim 34, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for the multiple UEs by expanding the combining zone of the first of the multiple UEs to include any radio point in the minimum combining zone of a second of the multiple UEs.

### Claim 36 (depends on 32)

The system of claim 32, wherein the controller is configured to assign the respective signal zone for each UE as a function of an ability of including each radio point in the respective combining zone of that UE to benefit the receiving of uplink transmissions from that UE.

### Claim 37 (depends on 31)

The system of claim 31, wherein the scheduler is configured to attempt to expand the combining zones used for receiving uplink transmissions for a transmission time interval (TTI) by expanding the combining zone of one or more of the UEs if less than a total front-haul capacity for communicating data between the one or more radio points and the controller is not being used for the TTI.

### Claim 38 (depends on 29)

The system of claim 29, wherein the controller is communicatively coupled to the radio points using a switched ETHERNET network.

### Claim 39 (depends on 29)

The system of claim 29, wherein the uplink transmissions comprise Physical Uplink Shared Channel (PUSCH) transmissions.

### Claim 40 (depends on 29)

The system of claim 29, wherein the scheduler is configured to, for any multiple UEs that are scheduled to make respective uplink transmissions during the same time-and-frequency resource, assign respective UE-specific demodulation reference signal (DM-RS) cyclic shifts to the multiple UEs, each of the UE-specific DM-RS cyclic shifts having an associated distance between that UE-specific DM-RS cyclic shift and each of the other UE-specific DM-RS cyclic shifts, wherein the DM-RS cyclic shifts are assigned to maximize the respective distances.

### Claim 41 (depends on 29)

The system of claim 29, wherein the scheduler is configured to perform link adaptation for uplink transmissions from the UEs by selecting a modulation and coding scheme (MCS) for each UE based on a measured signal-to-interference-plus-noise ratio (SINR) for the UE and a sequence of acknowledgement and negative acknowledgement (ACK/NACK) messages associated with the uplink transmissions from the UE.

### Claim 42

A system to provide wireless service comprising:
a controller; and
a plurality of radio points;
wherein each of the radio points is associated with at least one antenna and remotely located from the controller, wherein the plurality of radio points is communicatively coupled to the controller;
wherein the controller and the plurality of radio points are configured to implement a base station in order to provide wireless service to a plurality of user equipment (UEs) using a cell;
wherein the controller is communicatively coupled to a core network of a wireless service provider;
wherein the controller is configured to implement a scheduler to schedule uplink transmissions from the UEs;
wherein the scheduler is configured to perform link adaptation for uplink transmissions from the UEs by selecting a modulation and coding scheme (MCS) for each UE based on a measured signal-to-interference-plus-noise ratio (SINR) for the UE and a sequence of acknowledgement and negative acknowledgement (ACK/NACK) messages associated with the uplink transmissions from the UE.

### Claim 43 (depends on 42)

The system of claim 42, wherein selecting the MCS for each UE based on the SINR for the UE and the sequence of ACK/NACK messages associated with the uplink transmissions from the UE comprises:
determining an average modified SINR for each UE;
determining an augmented average SINR for each UE by applying an adaptation loop variable for the UE to the average modified SINR for the UE; and
selecting the MCS for each UE based on the determined augmented average SINR for the UE.