Devices for multi-cell communications
First Claim
Patent Images
1. A User Equipment (UE) configured for multi-cell communications, comprising:
- a processor;
memory in electronic communication with the processor;
instructions stored in the memory, the instructions being executable to;
set multiple uplink time alignment timers for UE to have different uplink transmission timings for each group, wherein the multiple uplink time alignment timers are constituted by (i) a primary cell (PCell) time alignment timer for a group including at least a PCell and (ii) one or more secondary cell (SCell) time alignment timers for one or more groups including one or more SCells, and wherein each group shares a same uplink transmission timing;
determine whether the PCell time alignment timer is expired; and
when the PCell time alignment timer expires;
(i) set all the SCell time alignment timers as expired without releasing the SCell time alignment timers, and (ii) flush all hybrid automatic repeat request (HARQ) buffers,wherein in a case that the SCell time alignment timer expires, all HARQ buffers for the SCell are flushed,wherein each time alignment timer is started or restarted in a case when a corresponding timing advance command is received, andwherein each of the one or more SCell time alignment timers has an expiry value signaled independently from an expiry value of the PCell time alignment timer.
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Abstract
A User Equipment (UE) configured for multi-cell communications is disclosed. The UE includes a processor and instructions stored in memory that is in electronic communication with the processor. The UE determines a primary cell (PCell) with a corresponding PCell time alignment timer. The UE also determines a secondary cell (SCell) with a corresponding SCell time alignment timer. The UE further determines whether the PCell time alignment timer is expired. The UE additionally sets the SCell time alignment timer as expired if the PCell time alignment timer is expired.
46 Citations
14 Claims
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1. A User Equipment (UE) configured for multi-cell communications, comprising:
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a processor; memory in electronic communication with the processor; instructions stored in the memory, the instructions being executable to; set multiple uplink time alignment timers for UE to have different uplink transmission timings for each group, wherein the multiple uplink time alignment timers are constituted by (i) a primary cell (PCell) time alignment timer for a group including at least a PCell and (ii) one or more secondary cell (SCell) time alignment timers for one or more groups including one or more SCells, and wherein each group shares a same uplink transmission timing; determine whether the PCell time alignment timer is expired; and when the PCell time alignment timer expires;
(i) set all the SCell time alignment timers as expired without releasing the SCell time alignment timers, and (ii) flush all hybrid automatic repeat request (HARQ) buffers,wherein in a case that the SCell time alignment timer expires, all HARQ buffers for the SCell are flushed, wherein each time alignment timer is started or restarted in a case when a corresponding timing advance command is received, and wherein each of the one or more SCell time alignment timers has an expiry value signaled independently from an expiry value of the PCell time alignment timer. - View Dependent Claims (2, 3, 4, 5)
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6. A method for enabling multi-cell communications on a user equipment (UE), comprising:
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setting multiple uplink time alignment timers for UE to have different uplink transmission timings for each group, wherein the multiple uplink time alignment timers are constituted by (i) a primary cell (PCell) time alignment timer for a group including at least a PCell and (ii) one or more secondary cell (SCell) time alignment timers for one or more groups including one or more SCells, and wherein each group shares a same uplink transmission timing; determining whether the PCell time alignment timer is expired; and when the PCell time alignment timer expires;
(i) setting all the SCell time alignment timers as expired without releasing the SCell time alignment timers, and (ii) flush all hybrid automatic repeat request (HARQ) buffers,wherein in a case that the SCell time alignment timer expires, all HARQ buffers for the SCell are flushed, wherein each time alignment timer is started or restarted in a case when a corresponding timing advance command is received; and wherein each of the one or more SCell time alignment timers has an expiry value signaled independently from an expiry value of the PCell time alignment timer. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory, tangible computer-readable medium for enabling multi-cell communications on a user equipment (UE), comprising executable instructions for:
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setting multiple uplink time alignment timers for UE to have different uplink transmission timings for each group, wherein the multiple uplink time alignment timers are constituted by (i) a primary cell (PCell) time alignment timer for a group including a PCell and (ii) one or more secondary cell (SCell) time alignment timers for one or more groups including one or more SCells, and wherein each group shares a same uplink transmission timing; determining whether the PCell time alignment timer is expired; and when the PCell time alignment timer expires;
(i) setting all the SCell time alignment timers as expired without releasing the SCell time alignment timers, and (ii) flush all hybrid automatic repeat request (HARQ) buffers,wherein in a case that the SCell time alignment timer expires, all HARQ buffers for the SCell are flushed, wherein each time alignment timer is started or restarted in a case a corresponding timing advance command is received, and wherein each of the one or more SCell time alignment timers has an expiry value signaled independently from an expiry value of the PCell time alignment timer. - View Dependent Claims (12, 13)
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14. A user equipment (UE) configured for multi-cell communications, comprising:
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a primary cell (PCell) time alignment timer; one or more secondary cell (SCell) time alignment timers; an operation circuitry configured or programmed to; set multiple uplink time alignment timers for UE to have different uplink transmission timings for each group, wherein the multiple uplink time alignment timers are constituted by (i) the primary cell (PCell) time alignment timer for a group including at least a PCell and (ii) the one or more secondary cell (SCell) time alignment timers for one or more groups including one or more SCells, and wherein each group shares a same uplink transmission timing; determine whether the PCell time alignment timer is expired; and when the PCell time alignment timer expires;
(i) set all the SCell time alignment timers as expired without releasing the SCell time alignment timers, and (ii) flush all hybrid automatic repeat request (HARQ) buffers,wherein in a case that the SCell time alignment timer expires, all HARQ buffers for the SCell are flushed, wherein each time alignment timer is started or restarted in a case when a corresponding timing advance command is received, and wherein each of the one or more SCell time alignment timers has an expiry value signaled independently from an expiry value of the PCell time alignment timer.
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Specification