METHOD AND APPARATUS FOR MOBILITY ENHANCEMENT
Systems, apparatuses, and methods for a radio resource management (RRM) decision in wireless communication network are provided. In particular, post-processing metric is introduced in RRM decision making. Certain aspects of the disclosure involve, a method, performed at a user equipment (UE) of a wireless communications network. The method includes receiving a reference signal from a network node, processing the reference signal based on a receiver processing algorithm, identifying a post-processing metric based at least in part on the received reference signal, and triggering a mobility event based at least in part on the post-processing metric.
1 . A method performed at a user equipment (UE) of a wireless communications network, the method comprising:
receiving a reference signal;
identifying a post-processing metric based at least in part on the received reference signal; and
triggering a mobility event based at least in part on the post-processing metric.
2 . The method of claim 1 , further comprising informing the network that the UE is capable of identifying the post-processing metric.
3 . The method of claim 1 , further comprising receiving an indication from the network to use the post-processing metric to trigger the mobility event.
4 . The method of claim 1 , wherein triggering the mobility event comprises the UE performing cell selection or reselection.
5 . The method of claim 1 , wherein triggering the mobility event comprises performing a handover procedure.
6 . The method of claim 1 , wherein the post-processing metric represents a performance of a receiver processing algorithm.
7 . The method of claim 6 , wherein the receiver processing algorithm comprises at least one of a Maximum Ration Combining (MRC) algorithm, a Minimum Mean Square Error (MMSE) algorithm, a MMSE-Interference Rejection Combining (MMSE-IRC) algorithm, an Interference Cancellation (IC) algorithm, or a Rake algorithm.
8 . The method of claim 6 , wherein the receiver processing algorithm fulfills requirements corresponding to at least one of enhanced receiver type 1, 2, 3, or 3i.
9 . The method of claim 1 , wherein the post-processing metric represents a signal quality of a combination of signals from one or more receiver antenna ports of the UE.
10 . The method of claim 9 , wherein the combination of signals represents an optimization based on a cost function, the cost function including an inter-cell interference suppression criteria.
11 . The method of claim 1 , wherein triggering the mobility event comprises:
identifying a measurement report trigger event based at least in part on the post-processing metric;
generating a measurement report; and
transmitting the measurement report to the network.
12 . The method of claim 11 , wherein the measurement report includes the post-processing metric.
13 . The method of claim 12 , wherein the measurement report trigger event is one of a Type I event or a Type II event.
14 . The method of claim 13 , wherein the Type I event is triggered when a signal quality of a serving cell of the UE becomes worse than a threshold.
15 . The method of claim 13 , wherein the Type II event is triggered when a signal quality of a neighboring cell of the UE exceeds a threshold.
16 . The method of claim 11 , further comprising:
receiving, from the network, control information instructing the UE to include one or more neighboring cell measurements into the measurement report;
including the one or more neighboring cell measurements into the measurement report; and
transmitting the measurement report to a network node.
17 . The method of claim 1 , wherein identifying a post-processing metric based on the received reference signal comprises measuring a signal quality based on the received reference signal based at least in part on one or more of an estimated channel response between a transmit and receive antenna pair, interference statistics, a block error rate, or a transmission mode.
18 . The method of claim 1 , wherein the post-processing metric is at least one or more of a measure of traffic channel spectral efficiency, a measure of control channel demodulation quality, a measure of reference signal or data channel Signal to Interference plus Noise Ratio (SINR), or a Channel Quality Indicator (CQI).
19 . The method of claim 1 , wherein the reference signal is received during a subset of subframes.
20 . The method of claim 19 , wherein the subset of subframes is one of Almost Blank Subframes (ABS) and MBSFN.
21 . The method of claim 1 , further comprising processing the received reference signal to identify the post-processing metric.
22 . A user equipment (UE) of a wireless communications network, the UE operable to:
receive a reference signal;
identify a post-processing metric based at least in part on the received reference signal; and
trigger a mobility event based at least in part on the post-processing metric.
23 . The UE of claim 22 , further operable to inform the network that the UE is capable of identifying the post-processing metric.
24 . The UE of claim 22 , further operable to receive an indication from the network to use the post-processing metric to trigger the mobility event.
25 . The UE of claim 22 , wherein triggering the mobility event comprises the UE performing cell selection or reselection.
26 . The UE of claim 22 , wherein the mobility event comprises performing a handover procedure.
27 . The UE of claim 22 , wherein the post-processing metric represents a performance of a receiver processing algorithm.
28 . The UE of claim 27 , wherein the receiver processing algorithm comprises at least one of a Maximum Ration Combining (MRC) algorithm, a Minimum Mean Square Error (MMSE) algorithm, a MMSE-Interference Rejection Combining (MMSE-IRC) algorithm, an Interference Cancellation (IC) algorithm, or a Rake algorithm.
29 . The UE of claim 27 , wherein the receiver processing algorithm fulfills requirements corresponding to at least one of enhanced receiver type 1, 2, 3, 3i.
30 . The UE of claim 26 , wherein the post-processing metric represents a signal quality of a combination of signals from one or more receiver antenna ports of the UE.
31 . The UE of claim 30 , wherein the combination of signals represents an optimization based on a cost function, the cost function including an inter-cell interference suppression criteria.
32 . The UE of claim 22 , wherein triggering the mobility event comprises:
identifying a measurement report trigger event based at least in part on the post-processing metric;
generating a measurement report; and
transmitting the measurement report to the network.
33 . The UE of claim 32 , wherein the measurement report includes the post-processing metric.
34 . The UE of claim 33 , wherein the measurement report trigger event is one of a Type I event or a Type II event.
35 . The UE of claim 34 , wherein the Type I event is triggered when a signal quality of a serving cell of the UE becomes worse than a threshold.
36 . The UE of claim 34 , wherein the Type II event is triggered when a signal quality of a neighboring cell of the UE exceeds a threshold.
37 . The UE of claim 32 , further operable to:
receive, from the network, control information instructing the UE to include one or more neighboring cell measurements into the measurement report;
include the one or more neighboring cell measurements into the measurement report; and
transmit the measurement report to a network node.
38 . The UE of claim 22 , wherein identifying a post-processing metric based on the received reference signal comprises measuring a signal quality based on the received reference signal based at least in part on one or more of an estimated channel response between a transmit and receive antenna pair, interference statistics, a block error rate, or a transmission mode.
39 . The UE of claim 22 , wherein the post-processing metric is at least one or more of a measure of traffic channel spectral efficiency, a measure of control channel demodulation quality, a measure of reference signal or data channel Signal to Interference plus Noise Ratio (SINR), or a Channel Quality Indicator (CQI).
40 . The UE of claim 22 , wherein the reference signal is received during a subset of subframes.
41 . The UE of claim 40 , wherein the subset of subframes is one of Almost Blank Subframes (ABS) and MBSFN.
42 . The UE of claim 22 , further operable to process the received reference signal to identify a post-processing metric.
43 . A method performed at a network node of a wireless communications network, the method comprising:
transmitting a reference signal to a user equipment (UE) of the network, wherein the UE is capable of identifying a post-processing metric based at least in part on the transmitted reference signal; and
receiving, from the UE, an indication of a mobility event, wherein the mobility event is triggered based at least in part on the post-processing metric.
44 . The method of claim 43 , further comprising receiving an indication from the UE that the UE is capable of identifying the post-processing metric.
45 . The method of claim 43 , further comprising transmitting, to the UE, an indication instructing the UE to use the post-processing metric to trigger the mobility event.
46 . The method of claim 43 , wherein the mobility event comprises a cell selection or reselection event.
47 . The method of claim 43 , wherein the mobility event comprises performing a handover procedure.
48 . The method of claim 43 , wherein the post-processing metric represents at least one or more of a performance of a receiver processing algorithm, a signal quality of a combination of signals from one or more receiver antenna ports of the UE, or an optimization based on a cost function, the cost function including an inter-cell interference suppression criteria.
49 . The method of claim 43 , wherein the mobility event is a measurement report trigger event and the indication comprises a measurement report.
50 . The method of claim 49 , further comprising making a handover decision based at least in part on the measurement report.
51 . The method of claim 49 , wherein the measurement report trigger event is one of a Type I event or a Type II event.
52 . The method of claim 51 , wherein the Type I event is triggered when a signal quality of a serving cell of the UE becomes worse than a threshold.
53 . The method of claim 51 , wherein the Type II event is triggered when a signal quality of a neighboring cell of the UE becomes better than a threshold.
54 . The method of claim 49 , further comprising transmitting control information instructing the UE to include one or more neighboring cell measurements into the measurement report.
55 . The method of claim 43 , wherein the reference signal is transmitted during a subset of subframes.
56 . The method of claim 55 , wherein the subset of subframes is one of Almost Blank Subframes (ABS) and MBSFN.