Measurement-based random access configuration
地域：
Kista
摘要
A method includes: receiving one or more synchronization signals; deriving a synchronization reference from the one or more synchronization signals; receiving a plurality of reference signals; based on the derived synchronization reference, performing a plurality of measurements on the plurality of reference signals; based on the plurality of measurements, selecting a plurality of random access resources; and selecting a random access resource from the plurality of random access resources for transmitting a random access signal to at least one of the one or more TP's.
說(shuō)明書
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
The present invention relates generally to cellular telecommunication systems, and in particular to systems and methods for performing a random access based on measurements of one or more reference signals.
In many wireless communication systems, a network communicates with mobile devices (henceforth devices). In Long Term Evolution (LTE), for example, devices are usually called user equipments (UE's). The network transmits and receives wireless signals through transmission points (TP's). In traditional cellular wireless communication systems, different TPs are often associated with different cells, wherein a TP typically refers to the antenna system of a base station, e.g., a macro or a pico base station. In some cellular wireless communication systems, several different TP's are associated with the same cell, for example when the TP's are remote radio units (RRU's) connected to a base station, when the TP's constitute a distributed antenna system (DAS) or when some TP's act as relays. Different TP's are typically not co-located but this expression refers primarily to the TP antenna systems, since other capabilities, such as baseband processing, may be co-located. Data is typically transmitted between a TP and UE using one communication carrier, i.e., a carrier center frequency and bandwidth within which the wireless signals are transmitted. A TP often supports simultaneous communication on multiple different carriers. In such cases it is natural that a TP is associated with different cells on different carriers. In some wireless communication systems, devices may act as TP's, for instance as relays. In this role, the device may assist other devices to access the network.
權(quán)利要求
What is claimed is:1. A method for a device to communicate with one or more transmission points (TPs), comprising:receiving a plurality of synchronization signals; performing a plurality of measurements on the plurality of synchronization signals; selecting a first synchronization signal with a measurement result above a threshold from the plurality of synchronization signals based on the plurality of measurements; receiving a signal that includes configuration information indicating a mapping between a set of allowed random access resources and the first synchronization signal; selecting a random access resource from the set of allowed random access resources based on the mapping; and transmitting a random access signal on the selected random access resource to at least one of the one or more TPs. 2. The method of claim 1 , further comprising:receiving a system information containing a configuration of the plurality of synchronization signals, wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals. 3. The method of claim 1 , wherein:each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index. 4. The method of claim 1 , wherein:the plurality of synchronization signals are received periodically in bursts; and a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts. 5. The method of claim 4 , further comprising:receiving a burst that comprises both a system information and a measurement reference signal (RS); determining a presence of the system information based on a presence of the measurement RS on the burst; and demodulating the system information based on the measurement RS. 6. A method for one or more transmission points (TPs) to communicate with a device, comprising:transmitting a plurality of synchronization signals to the device, wherein the plurality of synchronization signals are configured for the device to perform a plurality of measurements; sending a signal that includes configuration information indicating a mapping between a set of allowed random access resources and a first synchronization signal from the plurality of synchronization signals, wherein the first synchronization signal corresponds to a measurement result obtained from the plurality of measurements and the measurement result is above a threshold; and receiving a random access signal from the device on a random access resource selected based on the mapping, by the device, from the set of allowed random access resources. 7. The method of claim 6 , further comprising:sending a system information containing a configuration of the plurality of synchronization signals, wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals. 8. The method of claim 6 , wherein:each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index. 9. The method of claim 6 , wherein:the plurality of synchronization signals are transmitted periodically in bursts; and a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts. 10. The method of claim 9 , further comprising:sending a burst that comprises both a system information and a measurement reference signal (RS) to the device, wherein the measurement RS is configured for the device to demodulate the system information. 11. A device, comprising:a receiver configured to receive a plurality of synchronization signals; at least one processor configured to:perform a plurality of measurements on the plurality of synchronization signals, and select a first synchronization signal with a measurement result above a threshold from the plurality of synchronization signals based on the plurality of measurements, wherein the receiver is further configured to receive a signal that includes configuration information indicating a mapping between a set of allowed random access resources and the first synchronization signal, wherein the at least one processor is further configured to select a random access resource from the set of allowed random access resources based on the mapping; and a transmitter configured to transmit a random access signal on the selected random access resource to at least one of the one or more TPs. 12. The device of claim 11 , wherein the receiver is further configured to:receive a system information containing a configuration of the plurality of synchronization signals, wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals. 13. The device of claim 11 , wherein:each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index. 14. The device of claim 11 , wherein:the plurality of synchronization signals are received periodically in bursts; and a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts. 15. The device of claim 14 , wherein:the receiver is further configured to receive a burst that comprises both a system information and a measurement reference signal (RS); and the at least one processor is further configured to:determine a presence of the system information based on a presence of the measurement RS on the burst, and demodulate the system information based on the measurement RS. 16. A transmission point (TP), comprising:a transceiver configured to:transmit a plurality of synchronization signals to a device, wherein the plurality of synchronization signals are configured for the device to perform a plurality of measurements, send a signal that includes configuration information indicating a mapping between a set of allowed random access resources and a first synchronization signal from the plurality of synchronization signals, wherein the first synchronization signal corresponds to a measurement result obtained from the plurality of measurements and the measurement result is above a threshold, and receive a random access signal from the device on a random access resource selected based on the mapping, by the device, from the set of allowed random access resources. 17. The TP of claim 16 , wherein the transceiver is further configured to:send a system information containing a configuration of the plurality of synchronization signals, wherein the configuration comprises at least one of: (a) a number of the plurality of synchronization signals, or (b) time domain positions of the plurality of synchronization signals. 18. The TP of claim 16 , wherein:each of the plurality of synchronization signals is mapped to a respective set of different sets of allowed random access resources; and the different sets of allowed random access resources are disjoint based on at least one of: time resource index, frequency resource index, or preamble index. 19. The TP of claim 16 , wherein:the plurality of synchronization signals are transmitted periodically in bursts; and a burst period of the bursts is at least 10 times larger than a burst duration of each one of the bursts. 20. The TP of claim 19 , wherein the transceiver is further configured to:send a burst that comprises both a system information and a measurement reference signal (RS) to the device, wherein the measurement RS is configured for the device to demodulate the system information.
意見(jiàn)反饋
使用該功能遇到問(wèn)題
該功能需要專業(yè)版企業(yè)版VIP權(quán)限，您可以：
您也可以聯(lián)系官方QQ: 2157717237 電話: 13264338900