Signal sending method, signal detection method, related apparatus, and system

Patent metadata

Field	Value
Publication number	US-2016309398-A1
Application number	US-201615195610-A
Country	US
Kind code	A1
Filing date	Jun 28, 2016
Priority date	Dec 28, 2013
Publication date	Oct 20, 2016
Grant date	—

Abstract

Embodiments of the present disclosure provide a method, where the method includes: when determining that a first cell enters or prepares to enter a dormant state, sending, by a base station, a first signal to a user equipment (UE) in the first cell, where the first signal carries information about time when the first cell enters the dormant state, for determining, according to the information about the time, that the first cell enters the dormant state; and when determining that the first cell enters an active state from the dormant state, sending, by the base station, a second signal to the user equipment in the first cell, for determining, according to the second signal, that the first cell enters the active state. By using technical solutions provided in the present disclosure, the UE can discover a state change of a cell in time.

First claim

1 . A signal sending method, comprising:
in response to determining that a first cell enters or prepares to enter a dormant state, sending, by a base station, a first signal to a user equipment in the first cell, wherein the first signal carries information about a time when the first cell enters the dormant state, for determining, according to the information about the time, that the first cell enters the dormant state; and in response to determining that the first cell enters an active state from the dormant state, sending, by the base station, a second signal to the user equipment in the first cell, for determining, according to the second signal, that the first cell enters the active state, wherein the second signal is any one or a combination of any two or more of the following signals: a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a cell-specific reference signal (CRS), and a channel state information-reference signal (CSI-RS).

2 . The method according to claim 1 , wherein the sending the first signal to the user equipment in the first cell comprises:
sending the first signal to the user equipment in the first cell, wherein the first signal carries a start time point at which the first cell enters the dormant state, for determining, according to the start time point at which the first cell enters the dormant state, that the first cell enters the dormant state at the start time point.

3 . The method according to claim 1 , wherein the sending the first signal to user equipment in the first cell comprises:
sending the first signal to the user equipment in the first cell, wherein the first signal carries at least one time period in which the first cell enters the dormant state, for determining, according to the at least one time period in which the first cell enters the dormant state, that the first cell is in the dormant state within the at least one time period.

4 . The method according to claim 1 , wherein the sending the first signal to the user equipment in the first cell comprises:
sending a discovery signal to the user equipment in the first cell according to a preset sending manner of the discovery signal, wherein the sending manner of the discovery signal comprises one or two of a time-frequency resource location and a sending period that are of the discovery signal.

5 . The method according to claim 1 , wherein the sending the second signal to the user equipment in the first cell comprises:
sending the second signal to the user equipment in the first cell according to a preset sending manner of the second signal, wherein the sending manner of the second signal comprises one or two of a time-frequency resource location and a sending period that are of the second signal.

6 . A signal detection method, comprising:
receiving, by a user equipment, a first signal, wherein the first signal carries information about a time when the first cell enters a dormant state; determining, by the user equipment according to the information about the time, that the first cell enters the dormant state; detecting, by the user equipment, a second signal; and in response to the second signal being detected, determining, by the user equipment according to the second signal, that the first cell enters an active state, wherein the second signal is any one or a combination of any two or more of the following signals: a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a cell-specific reference signal (CRS), and a channel state information-reference signal (CSI-RS).

7 . The method according to claim 6 , wherein the first signal carries a start time point at which the first cell enters the dormant state; and
the determining, by the user equipment according to the first signal, that the first cell enters the dormant state comprises:
determining, by the user equipment according to the start time point at which the first cell enters the dormant state, that the first cell enters the dormant state at the start time point.

8 . The method according to claim 6 , wherein the first signal carries at least one time period in which the first cell enters the dormant state; and
the determining, by the user equipment according to the first signal, that the first cell enters the dormant state comprises:
determining, by the user equipment according to the at least one time period in which the first cell enters the dormant state, that the first cell is in the dormant state within the at least one time period.

9 . The method according to claim 6 , wherein:
the receiving, by the user equipment, the first signal comprises receiving a discovery signal; and the determining, by the user equipment according to the first signal, that the first cell enters the dormant state comprises:
determining, by the user equipment according to a sending manner of the received discovery signal, that the first cell enters the active state, wherein the sending manner of the discovery signal comprises one or two of a time-frequency resource location and a sending period that are of the discovery signal.

10 . The method according to claim 6 , wherein the determining, by the user equipment according to the second signal, that the first cell enters an active state from the dormant state comprises:
detecting a sending manner of the second signal; and determining, by the user equipment according to the sending manner of the second signal, that the first cell enters the active state, wherein the sending manner of the second signal comprises one or two of a time-frequency resource location and a sending period that are of the second signal.

11 . A base station, comprising:
a transceiving apparatus; and a processor, configured to:
in response to the base station determining that a first cell enters or prepares to enter a dormant state, control the transceiving apparatus to send a first signal to a user equipment in the first cell, wherein the first signal carries information about a time when the first cell enters the dormant state, for determining, according to the information about the time, that the first cell enters the dormant state, and when the first cell enters an active state from the dormant state, control the transceiving apparatus to send a second signal to the user equipment in the first cell, for determining, according to the second signal, that the first cell enters the active state,
wherein the second signal is any one or a combination of any two or more of the following signals: a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a cell-specific reference signal (CRS), and a channel state information-reference signal (CSI-RS).

12 . The base station according to claim 11 , wherein the processor is further configured to send the first signal to the user equipment in the first cell, wherein the first signal carries a start time point at which the first cell enters the dormant state, for determining, according to the start time point at which the first cell enters the dormant state, that the first cell enters the dormant state at the start time point.

13 . The base station according to claim 11 , wherein the processor is further configured to send the first signal to the user equipment in the first cell, wherein the first signal carries at least one time period in which the first cell enters the dormant state, for determining, according to the at least one time period in which the first cell enters the dormant state, that the first cell is in the dormant state within the at least one time period.

14 . The base station according to claim 11 , wherein the

Assignees

• Huawei Tech Co Ltd

Inventors

• Xue Lixia
• Mazzarese David Jean-Marie
• Guan Lei

Classifications

• H04W48/14 Primary

  using user query {or user detection} · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W52/0206 Primary

  in access points, e.g. base stations · CPC title

• H04W68/00

  User notification, e.g. alerting and paging, for incoming communication, change of service or the like · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title