Patent Description:
In a wireless communication system, a terminal needs to search for a synchronization signal at each possible frequency point of a particular frequency band during initial access, handover or cell selection. After finding the synchronization signal, the terminal may complete downlink time synchronization and frequency synchronization with a physical carrier, detect a broadcast channel and acquire a system configuration message. The system configuration message includes information of a physical carrier bandwidth, configuration of a random access channel (or an uplink synchronization channel) and the like.

After acquiring the system configuration message, the terminal transmits a random access signal (or an uplink synchronization signal), that is, a signal transmitted on the random access channel, that is, a first message, and performs an uplink synchronization process. After successfully detecting the random access signal, a base station measures a timing advance, and transmits at least one of the timing advance or a random access signal identifier corresponding to the timing advance is transmitted to the terminal through a random access response signal (response information for the signal transmitted on the random access channel, that is, a second message). The terminal searches for an identifier of a random access signal used by the terminal, and transmits feedback information (information transmitted based on the response information, i.e., a third message) for the second message to the base station by using a timing advance corresponding to the identifier. The third message includes the identifier of the terminal. After the base station detects the third message, the base station transmits feedback information (i.e., a fourth message) for the third message, for confirming to the terminal that the uplink synchronization process has been completed.

In addition, for a simplified random access process, the terminal only transmits the first message including a signal for measuring the timing advance and a terminal identifier, and the base station only transmits the second message including at least one of the timing advance, the random access signal identifier and the terminal identifier in the received first message.

The physical carrier center frequency point (i.e., direct current frequency) is disposed on a frequency-domain location corresponding to a channel number. A frequency interval between adjacent channel numbers is referred to as a channel raster interval or a carrier raster interval. A frequency-domain step size used by the terminal for searching for the synchronization signal is referred to as a frequency raster interval or a user equipment (UE) raster interval. In the LTE system, the UE raster interval is the same as the channel raster interval. That is, the terminal searches for the synchronization signal on frequency-domain locations corresponding to all possible channel numbers.

In the 5th generation mobile communication system, in order to reduce the complexity of the terminal frequency domain search, the industry proposes to use a larger UE raster interval. That is, the UE raster interval may be larger than the channel raster interval (as shown in <FIG>). In this case, the position of the center frequency point (i.e., the direct current frequency) of the synchronization signal, the broadcast channel, or other signal or channel associated with the initial access limits the minimum bandwidth of the system. That is because the frequency-domain resources occupied by these signals or channels cannot exceed the range of the frequency-domain resources of the physical carrier.

<CIT> relates to a method for transmitting at least one channel for cell search in a communications system using a system carrier with a first centre frequency.

The scope of the invention is defined and limited by the appended set of independent claims.

The following is a summary of the subject matter described herein in detail. This summary is not intended to limit the scope of the claims.

In view of this, embodiments of the present disclosure relate to frequency domain synchronization during wireless channel access. According to the solution, a center frequency point of at least one of the signal and the channel associated with the initial access of the terminal is determined, and the allocation of frequency domain resources to at least one of the signal and the channel is more flexible. If the center frequency point of the first frequency domain resource set deviates from the center frequency point of the physical carrier, the available bandwidth of the first frequency domain resource set would be limited. In a case where the physical carrier bandwidth is small, the problem becomes more serious. The embodiments of the present disclosure ensure that when the UE raster is sparser than the channel raster, the position of at least one synchronization signal direct current (DC) subcarrier (or a center subcarrier) has the least influence on the minimum bandwidth of the system, and the corresponding synchronization signal may be found by the UE. Therefore, the limitation on the minimum system bandwidth is reduced. The embodiments of the present disclosure may flexibly allocate more frequency domain resources to at least one of the signal and the channel (especially at least one of a signal and a channel other than the synchronization channel or broadcast channel) in the initial access process. As a result, the resource utilization efficiency is improved.

Other aspects can be understood after the drawings and detailed description are read and understood.

When the center frequency points of the synchronization signal, the broadcast channel or other signal or channel associated with the initial access is the same as the center frequency point of the physical carrier, the available bandwidth is the entire physical carrier bandwidth. However, when the center frequency point of the synchronization signal, the broadcast channel or other signal or channel associated with the initial access is different from the center frequency point of the physical carrier, the available bandwidth is less than the entire physical carrier bandwidth. When the physical carrier bandwidth is small, the problem becomes even more serious. In addition, the 5th generation mobile communication system will use a large physical carrier bandwidth for data transmission. However, in the initial access process, the terminal has not complete synchronization with the system. If the terminal or the base station sends or receives the signal or the channel associated with the initial access by using the carrier bandwidth same as that in the data transmission, the complexity of the terminal or the base station will be greatly improved.

<FIG> is a structural diagram of a signal sending device according to an embodiment of the present disclosure. Referring to <FIG>, the device is disposed on a first-type node, such as the base station, and includes a first transmission module <NUM>.

The first transmission module <NUM> is configured to send at least one of a signal and a channel to a second-type node on a first frequency domain resource set, or send at least one of the signal and the channel to the second-type node on the first frequency domain resource set and a second frequency domain resource set.

Each of the first frequency domain resource set and the second frequency domain resource set is a resource element (RE) set on a physical carrier, and a position of a center RE of the first frequency domain resource set is associated with a channel number of the physical carrier.

The first frequency domain resource set includes a resource block allocated based on the center RE of the first frequency domain resource set. That is, the center RE of the first frequency domain resource set is an edge RE of the resource block or a center RE of the resource block.

The bandwidth of the first frequency domain resource set is pre-set according to at least one of the signal and the channel sent by the first frequency domain resource set, and the bandwidth of the second frequency domain resource set is pre-set according to at least one of the signal and the channel sent by the second frequency domain resource set.

In an exemplary embodiment, the process in which the first transmission module sends at least one of the signal and the channel to the second-type node on the first frequency domain resource set includes: sending one of or any combination of a synchronization signal, a broadcast channel, a channel for sending a system message, a reference signal, response information for the signal transmitted on a random access channel, and feedback information for a random access process message.

In another exemplary embodiment, the process in which the first transmission module sends at least one of the signal and the channel to the second-type node on the second frequency domain resource set includes: sending one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information for the signal transmitted on the random access channel, and the feedback information for the random access process message.

As an optional implementation mode of the present disclosure, the process in which the first transmission module sends at least one of the signal and the channel on the first frequency domain resource set to the second-type node includes: sending the synchronization signal on the first frequency domain resource set, or sending the synchronization signal and the broadcast channel on the first frequency domain resource set.

In an embodiment in which the first transmission module sends the synchronization signal and the broadcast channel on the first frequency domain resource set, the process in which the first transmission module sends at least one of the signal and the channel to the second-type node on the second frequency domain resource set includes: sending, on the second frequency domain resource set, one of or any combination of the channel for sending the system message, the reference signal, the response information for the signal transmitted on the random access channel and the feedback information for the random access process message.

In an optional implementation mode, the center RE of the synchronization signal or the broadcast channel is the same as the center RE of the first frequency domain resource set. Of course, the center RE of the synchronization signal or the broadcast channel may be different from the center RE of the first frequency domain resource set, which is not be limited by the embodiments of the present disclosure.

In an exemplary embodiment, the device further includes a first receiving module <NUM>.

The first receiving module <NUM> is configured to receive at least one of the signal and the channel sent by the second-type node on a third frequency domain resource set.

In an exemplary embodiment, the process in which the first receiving module <NUM> receives at least one of the signal and the channel sent by the second-type node on the third frequency domain resource set includes: receiving, on the third frequency domain resource set, one of or any combination of: the response information for the signal transmitted on the random access channel and the feedback information for the random access process message.

In an exemplary embodiment, on the physical carrier, the number of the second frequency domain resource set is <NUM>. When the number of the second frequency domain resource set is <NUM>, multiple first frequency domain resource sets share one second frequency domain resource set. Of course, the number of the second frequency domain resource set may be more than one, which may be set according to actual requirements.

In an exemplary embodiment, at least one first frequency domain resource set exists on the physical carrier, and an index x(n) of the center RE of the first frequency domain resource set satisfies a following condition:
within a subrange of the channel number n of the physical carrier, an absolute value of a difference of the indices of the center REs of the resource sets A corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>.

In an exemplary embodiment, the subrange of the channel number n of the physical carrier is one of:
n∈[<NUM>,Q-<NUM>] , n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] , n∈[<NUM>,Q] , or n∈[Q+m·P+<NUM>·P,Q+(m+<NUM>)·P], where n is the channel number of the physical carrier, <MAT> or <MAT>, m is an integer greater than or equal to <NUM>, and P is a preset constant, a constant associated with a frequency band, or a ratio of a frequency scanning step size of the second-type node to a frequency interval of adjacent channel numbers.

In an exemplary embodiment, x(<NUM>)=<NUM>, and Ω =<NUM> or <NUM>.

In an exemplary embodiment, in each interval, x(n) is a monotonic increasing function of n or a monotonic decreasing function of n.

In an exemplary embodiment, the first transmission module <NUM> is configure to send to the second-type node identifiers of the center REs of the first frequency domain resource sets indicated by different sequences.

Alternatively, the first transmission module <NUM> is configured to notify, through the broadcast channel, information of the center RE of the first frequency domain resource set in which the broadcast channel is located to the second-type node.

Alternatively, the first transmission module <NUM> is configure to send the center RE of the second frequency domain resource set to the second-type node, where the center RE of the second frequency domain resource set is the same as the center RE of the physical carrier.

The first transmission module <NUM> is configured to notify, through the broadcast channel, the second-type node of position information of the center RE of the second frequency domain resource set.

In an exemplary embodiment, the first transmission module <NUM> is further configured to notify, through the broadcast channel, at least one of bandwidth information of the preset first frequency domain resource set and bandwidth information of the preset second frequency domain resource set.

In an exemplary embodiment, the process in which the first receiving module <NUM> receives at least one of the signal and the channel sent by the second-type node on the third frequency domain resource set includes:
receiving, on the uplink carrier corresponding to the physical carrier, at least one of the signal and the channel sent by the second-type node; receiving, on the third frequency domain resource set which is the same as the second frequency domain resource set, at least one of the signal and the channel sent by the second-type node; or receiving, on the third frequency domain resource set which is the same as the first frequency domain resource set, at least one of the signal and the channel sent by the second-type node.

For a frequency division duplex (FDD) system, the third frequency domain resource set is located on the uplink carrier corresponding to the physical carrier. Optionally, for a time division duplex (TDD) system, the third frequency domain resource set is the same as the second frequency domain resource set or the first frequency domain resource set.

When the system is the FDD system, a center RE of the third frequency domain resource set is the same as a center RE of the uplink carrier corresponding to the physical carrier.

The embodiments of the present disclosure further provide a base station, including the signal sending device described above. For the description of the signal sending device, reference may be made to the embodiment described above, and will not be repeated herein.

<FIG> is a schematic diagram of a signal sending method according to an embodiment of the present disclosure. Referring to <FIG>, the method is applied to the first-type node, such as the base station, and includes steps described below.

In step <NUM>, at least one of a signal and a channel is sent to a second-type node on a first frequency domain resource set; or at least one of the signal and the channel is sent to the second-type node on the first frequency domain resource set and a second frequency domain resource set.

In step <NUM>, at least one of the signal and the channel sent by the second-type node is received on a third frequency domain resource set.

Each of the first frequency domain resource set and the second frequency domain resource set is a resource element (RE) set on the physical carrier, and the position of the center RE of the first frequency domain resource set is associated with the channel number of the physical carrier.

The first frequency domain resource set includes a resource block allocated based on the center RE of the first frequency domain resource set. That is, the center RE of the first frequency domain resource set is the edge RE of the resource block or the center RE of the resource block.

In an exemplary embodiment, the step of sending at least one of the signal and the channel to the second-type node on the first frequency domain resource set includes: sending one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information (a second message) for the signal sent on the random access channel and the feedback information (a fourth message) for the random access process message.

In an exemplary embodiment, the step of sending at least one of the signal and the channel to the second-type node on the second frequency domain resource set includes: sending one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information (the second message) for the signal sent on the random access channel and the feedback information (the fourth message) for the random access process message.

In an exemplary embodiment, the step of sending at least one of the signal and the channel on the first frequency domain resource set to the second-type node includes: sending the synchronization signal on the first frequency domain resource set, or sending the synchronization signal and the broadcast channel on the first frequency domain resource set.

In an embodiment, the synchronization signal and the broadcast channel are sent on the first frequency domain resource set, or the synchronization signal is sent on the first frequency domain resource set, correspondingly, the step of sending at least one of the signal and the channel to the second-type node on the second frequency domain resource set includes: sending, on the second frequency domain resource set, one of or any combination of the channel for sending the system message, the reference signal, the response information (the second message) for the signal sent on the random access channel, and the feedback information (the fourth message) for the random access process message.

In an exemplary embodiment, the center RE of the first frequency domain resource set may be the same as the center RE of the synchronization signal or the broadcast channel. Since the position of the synchronization signal does not need to be notified additionally, the signaling overhead may be reduced.

In an exemplary embodiment, the step of receiving, on the third frequency domain resource set, at least one of the signal and the channel sent by the second-type node includes: receiving, on the third frequency domain resource set, one of or any combination of the signal transmitted on the random access channel (a first message) and the feedback information (the third message) for the random access process message.

In an exemplary embodiment, the number of the second frequency domain resource set on the physical carrier is <NUM>, which may reduce signal detection complexity for UE.

In an exemplary embodiment, the position of the center RE of the first frequency domain resource set is associated with the channel number of the physical carrier.

In an exemplary embodiment, at least one first frequency domain resource set exists on the physical carrier, and the index x(n) of the center RE of the first frequency domain resource set satisfies a following condition:
within the subrange of the channel number n of the physical carrier, the absolute value of the difference of the indices of the center REs of the first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>.

In an exemplary embodiment, the subrange of the channel number n of the physical carrier is one of:
n∈[<NUM>,Q-<NUM>] , n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] , n∈[<NUM>,Q] , or n∈[Q+m·P+<NUM>·P,Q+(m+<NUM>)·P], where n is the channel number of the physical carrier, <MAT> or <MAT>, m is an integer greater than or equal to <NUM>, and P is a preset constant, a constant associated with the frequency band, or a ratio of the frequency scanning step size of the second-type node to the frequency interval of adjacent channel numbers.

In an exemplary embodiment, x(<NUM>)=<NUM>.

In an exemplary embodiment, Ω =<NUM> or Ω =<NUM>.

In an exemplary embodiment, the information of the center REs of the first frequency domain resource sets are indicated by different sequences.

In another exemplary embodiment, the information of the center RE of the first frequency domain resource set where the broadcast channel is located is notified to the second-type node through the broadcast channel.

In an exemplary embodiment, the center RE of the second frequency domain resource set is the same as the center RE of the physical carrier.

In another exemplary embodiment, the position information of the center RE of the second frequency domain resource set is sent to the second-type node through the broadcast channel.

In an embodiment, the method further includes: sending, through the broadcast channel, at least one of the bandwidth information of the preset first frequency domain resource set and the bandwidth information of the preset second frequency domain resource set.

In an embodiment, when the system is the FDD system, the third frequency domain resource set is located on the uplink carrier corresponding to the physical carrier; when the system is the TDD system, the third frequency domain resource set is the same as the second frequency domain resource set, or the third frequency domain resource set is the same as the first frequency domain resource set.

When the system is the FDD system, the center RE of the third frequency domain resource set is the same as the center RE of the uplink carrier corresponding to the physical carrier.

<FIG> is a structural diagram of a signal receiving device according to an embodiment of the present disclosure. Referring to <FIG>, the device is disposed on the second-type node, such as the terminal, and includes a second receiving module <NUM>.

The second receiving module <NUM> is configured to receive at least one of the signal and the channel on the first frequency domain resource set, or receive at least one of the signal and the channel on the first frequency domain resource set and the second frequency domain resource set.

The second receiving module <NUM> is configured to receive at least one of the signal and the channel on the resource block allocated based on the center RE of the first frequency domain resource set. That is, the center RE of the first frequency domain resource set is the edge RE of the resource block or the center RE of the resource block.

In an embodiment, the process in which the second receiving module <NUM> receives at least one of the signal and the channel on the first frequency domain resource set includes: receiving one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information for the signal sent on the random access channel and the feedback information for the random access process message.

Alternatively, the process in which the second receiving module <NUM> receives at least one of the signal and the channel on the second frequency domain resource set includes: receiving one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information for the signal sent on the random access channel and the feedback information for the random access process message.

In an embodiment, the process in which the second receiving module 501receives at least one of the signal and the channel on the first frequency domain resource set includes: receiving the synchronization signal on the first frequency domain resource set, or receiving the synchronization signal and the broadcast channel on the first frequency domain resource set.

When the second receiving module receives the synchronization signal and the broadcast channel on the first frequency domain resource set, correspondingly, the process in which the second receiving module receives at least one of the signal and the channel on the second frequency domain resource set includes: receiving, on the second frequency domain resource set, one of or any combination of the channel for sending the system message, the reference signal, the response information of the signal sent on the random access channel and the feedback information of the random access process message.

In an embodiment, the device further includes a second transmission module <NUM>.

The second transmission module <NUM> is configured to send at least one of the signal and the channel to the first-type node on the third frequency domain resource set.

In an embodiment, the process in which the second transmission module <NUM> sends at least one of the signal and the channel to the first-type node on the third frequency domain resource set includes: sending, on the third frequency domain resource set, one of or any combination of the signal transmitted on the random access channel and the feedback information of the random access process message.

In an embodiment, the number of the second frequency domain resource set on the physical carrier is <NUM>. When the number of the second frequency domain resource set is <NUM>, multiple first frequency domain resource sets share one second frequency domain resource set. Of course, the number of the second frequency domain resource set may be more than one, which may be set according to actual requirements.

In an embodiment, the position of the center RE of the first frequency domain resource set is associated with the channel number of the physical carrier.

In an embodiment, at least one first frequency domain resource set exists on the physical carrier, and the index x(n) of the center RE of the first frequency domain resource set satisfies a following condition:
within the subrange of the channel number n of the physical carrier, the absolute value of the difference of the indices of the center REs of the first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω , Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>.

In an embodiment, the subrange of the channel number n of the physical carrier is one of:
n∈[<NUM>,Q-<NUM>] , n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] , n∈[<NUM>,Q] , or n∈[Q+m·P+<NUM>·P,Q+(m+<NUM>)·P], where n is the channel number of the physical carrier, <MAT> or <MAT>, m is an integer greater than or equal to <NUM>, and P is a preset constant, a constant associated with the frequency band, or a ratio of the frequency scanning step size of the second-type node to the frequency interval of adjacent channel numbers.

In an embodiment, x(<NUM>)=<NUM>, and Ω=<NUM> or Ω=<NUM>.

In an embodiment, the second receiving module <NUM> is configure to receive the information of the center REs of the first frequency domain resource sets indicated by different sequences.

In an alternative embodiment, the second receiving module <NUM> is configure to receive, through the broadcast channel, the information of the center RE of the first frequency domain resource set where the broadcast channel is located.

In an embodiment, the second receiving module <NUM> is configure to receive the center RE of the second frequency domain resource set being the same as the center RE of the physical carrier.

In an alternative embodiment, the second receiving module <NUM> is configured to receive, through the broadcast channel, the position information of the center RE of the second frequency domain resource set.

In an embodiment, the second receiving module <NUM> is further configured to receive, through the broadcast channel, at least one of the bandwidth information of the preset first frequency domain resource set and the bandwidth information of the preset second frequency domain resource set.

In an embodiment, the second transmission module <NUM> sends, according to parameters associated with the third frequency domain resource set, at least one of the signal and the channel on the third frequency domain resource set, including:
sending, on the uplink carrier corresponding to the physical carrier, at least one of the signal and the channel to the first-type node; or sending, on the third frequency domain resource set which is the same as the first frequency domain resource set or the second frequency domain resource set, at least one of the signal and the channel to the first-type node.

For the FDD system, the third frequency domain resource set is located on the uplink carrier corresponding to the physical carrier. For the TDD system, the third frequency domain resource set is the same as the second frequency domain resource set or the first frequency domain resource set.

The embodiments of the present disclosure further provide a terminal, including the signal receiving device described above. For the description of the signal receiving device, reference may be made to the embodiment described above, and will not be repeated herein.

<FIG> is a flowchart of a signal receiving method according to an embodiment of the present disclosure. Referring to <FIG>, the method is applied to the second-type node, such as the terminal, and includes steps described below.

In step <NUM>, at least one of a signal and a channel is received on a first frequency domain resource set; or at least one of the signal and the channel is received on the first frequency domain resource set and a second frequency domain resource set.

In step <NUM>, at least one of the signal and the channel is sent to a first-type node on a third frequency domain resource set.

The first frequency domain resource set includes the resource block allocated based on the center RE of the first frequency domain resource set. That is, the center RE of the first frequency domain resource set is the edge RE of the resource block or the center RE of the resource block.

The step in which at least one of the signal and the channel is received on the first frequency domain resource set includes: receiving one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information (the second message) of the signal sent on the random access channel and the feedback information (the fourth message) of a random access process message.

In an alternative embodiment, the step in which at least one of the signal and the channel is received on the second frequency domain resource set includes: receiving one of or any combination of the synchronization signal, the broadcast channel, the channel for sending the system message, the reference signal, the response information (the second message) of the signal sent on the random access channel (the second message) and the feedback information of a random access process message.

In an embodiment, the step in which at least one of the signal and the channel is received on the first frequency domain resource set includes: receiving the synchronization signal on the first frequency domain resource set, or receiving the synchronization signal and the broadcast channel on the first frequency domain resource set.

When the synchronization signal and the broadcast channel are received on the first frequency domain resource set, or the synchronization signal is received on the first frequency domain resource set, correspondingly, the step in which at least one of the signal and the channel is received on the second frequency domain resource set includes: receiving, on the second frequency domain resource set, one of or any combination of: the channel for sending the system message, the reference signal, the response information of the signal sent on the random access channel and the feedback information of the random access process message.

In an embodiment, the step in which at least one of the signal and the channel is sent on the third frequency domain resource set includes: sending, on the third frequency domain resource set, one of or any combination of: the signal (the first message) sent on the random access channel and the feedback information (the third message) of the random access process message.

In an embodiment, on the physical carrier, the number of the second frequency domain resource set is <NUM>.

In an embodiment, at least one first frequency domain resource set exists on the physical carrier, and an index x(n) of the center RE of the first frequency domain resource set satisfies a following condition:
within the subrange of the channel number n of the physical carrier, the absolute value of the difference of the indices of the center REs of the resource sets A corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>.

In an embodiment, the subrange of the channel number of the physical carrier is one of:
n∈[<NUM>,Q-<NUM>] , n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] , n∈[<NUM>,Q] , or n∈[Q+m·P+<NUM>·P,Q+(m+<NUM>)·P], where n is the channel number of the physical carrier, <MAT> or <MAT>, m is an integer greater than or equal to <NUM>, and P is a preset constant, a constant associated with the frequency band, or a ratio of the frequency scanning step size of the second-type node to the frequency interval of adjacent channel numbers.

In an embodiment, the information of the center REs of the first frequency domain resource sets indicated with different sequences is received.

Alternatively, the information of the center RE of the first frequency domain resource set where the broadcast channel is located is received through the broadcast channel.

In an embodiment, the center RE of the second frequency domain resource set which is the same as the center RE of the physical carrier is received.

Alternatively, the position information of the center RE of the second frequency domain resource set is received through the broadcast channel.

In an embodiment, the method further includes: receiving, through the broadcast channel, at least one of the bandwidth information of the preset first frequency domain resource set and the bandwidth information of the preset second frequency domain resource set.

In an embodiment, the step in which at least one of the signal and the channel is sent on the third frequency domain resource set includes:
sending, on the uplink carrier corresponding to the physical carrier, at least one of the signal and the channel to the first-type node; sending, on the third frequency domain resource set which is the same as the second frequency domain resource set, at least one of the signal and the channel to the first-type node; or sending, on the third frequency domain resource set which is the same as the first frequency domain resource set, at least one of the signal and the channel to the first-type node.

When the system is the FDD system, the third frequency domain resource set is located on the uplink carrier corresponding to the physical carrier. Alternatively, when the system is the TDD system, the third frequency domain resource set is the same as the first frequency domain resource set, or the third frequency domain resource set is the same as the second frequency domain resource set.

The present disclosure will be described below in detail through examples in specific applications.

If an index of the center subcarrier (e.g., the DC subcarrier of the physical carrier) of the resource set or the physical carrier is <NUM>, subcarriers whose frequency domain positions are lower than that of the center subcarrier are respectively numbered, according to their distances to the center subcarrier in an ascending mode, as -<NUM>, -<NUM>, -<NUM> and. ; and subcarriers whose frequency domain positions are higher than that of the center subcarrier are respectively numbered, according to their distances to the center subcarrier in an ascending mode, as <NUM>, <NUM>, <NUM> and. The subcarrier is also referred to as a resource element (RE).

It is assumed that the number of REs of the physical carrier or the resource set is N. When N is an odd number, the number of REs whose frequency domain positions are lower than that of the center RE is equal to the number of REs whose frequency domain positions are higher than that of the center RE, and the number is <MAT>. When N is an even number, the number of REs whose frequency domain positions are lower than that of the center RE is N/<NUM> (or N/<NUM>-<NUM>), while the number of REs whose frequency domain positions are higher than that of the center RE is N/<NUM>-<NUM> (or N/<NUM>).

In addition, the REs of the physical carrier, the resource set or the resource block may also be numbered as <NUM>, <NUM>, <NUM>,. , and N-<NUM> from the lowest frequency domain position to the highest frequency domain position. When N is the odd number, the center RE is numbered as <MAT>, while when N is the even number, the center RE is numbered as N/<NUM>-<NUM> or N/<NUM>+<NUM>.

When the UE raster interval (or the step size used by the terminal for frequency scanning) is <NUM> and the channel raster interval (or the frequency spacing of adjacent channel numbers) is <NUM>, P=<NUM>/<NUM>=<NUM> and Q=P/<NUM>=<NUM>.

Alternatively, when a specified constant of the communication system is <NUM> and the channel raster interval (or the frequency spacing of adjacent channel numbers) is <NUM>, P=<NUM>/<NUM>=<NUM> and Q=P/<NUM>=<NUM>.

Alternatively, the communication system sets that P=<NUM>, and Q=P/<NUM>=<NUM>.

Alternatively, in the low frequency bandwidth (the carrier frequency is less than or equal to <NUM>), the specified constant of the system is <NUM>, the channel raster interval (or the frequency spacing of adjacent channel numbers) is <NUM>, P=<NUM>/<NUM>=<NUM> and Q=P/<NUM>=<NUM>. In the high frequency bandwidth (the carrier frequency is greater than <NUM>), the specified constant of the system is <NUM>, the channel raster interval (or the frequency spacing of adjacent channel numbers) is <NUM>, P=<NUM>/<NUM>=<NUM> and Q=P/<NUM>=<NUM>. Alternatively, the channel raster interval in the high frequency bandwidth may be greater than the channel raster interval in the low frequency bandwidth.

Within the subrange of the channel number n of the physical carrier, the difference of the indices x(n) of the center REs of the first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>. That is, |x(n+<NUM>)-x(n)| =Ω, Ω+<NUM> or Ω-<NUM>, or |x(n-<NUM>)-x(n)|=Ω, Ω+<NUM>, Ω-<NUM>.

When the subcarrier bandwidth (or the subcarrier interval) is <NUM>, P=<NUM>, Q=P/<NUM>=<NUM> and x(<NUM>)=<NUM>, within the channel number interval n∈[<NUM>,Q-<NUM>] (i.e., <NUM>≤n≤Q-<NUM>=<NUM>), the indices of the center REs of the first frequency domain resource sets corresponding to adjacent channel numbers are {<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>}.

Within the channel number interval n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] (i.e., <NUM>+m*<NUM>≤n≤<NUM>+(m+<NUM>)*<NUM>-<NUM>, where m=<NUM>, <NUM>, <NUM>, and. ), the indices of the center REs of the first frequency domain resource sets corresponding to adjacent channel numbers are {<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>}. As shown in <FIG>, within each subrange of the channel numbers, x(n) is the monotonic decreasing function. When Ω =<NUM>, |x(n+<NUM>)-x(n)|=Ω (=<NUM>) or Ω-<NUM> (=<NUM>); and when Ω=<NUM>, |x(n+<NUM>)-x(n)|=Ω (=<NUM>) or Ω+<NUM> (=<NUM>).

When the first frequency domain resource set is used for transmitting the synchronization signal and the center RE of the first frequency domain resource set is the same as the center RE of the synchronization signal, the offset between the center frequency point of each first frequency domain resource set and the closest UE raster position does not exceed half of the bandwidth of the RE (or subcarrier). Since the offset may be corrected by the frequency offset correction, the offset will not affect the terminal's searching for the synchronization signal. At the same time, the center RE of each first frequency domain resource set is closest to the center RE of the physical carrier corresponding to the channel number corresponding to the first frequency domain resource set, thereby reducing the limitation on the minimum physical carrier bandwidth.

For example, for the channel number n=<NUM>, the center frequency point of the physical carrier is f_low+<NUM>, the index of the center RE of the first frequency domain resource set is <NUM>, and the center frequency point of the center RE of the synchronization signal is the same as the center frequency point of the center RE of the first frequency domain resource set, that is, f_low+<NUM>+<NUM>*<NUM>=f_low+<NUM>. Since the difference between the center frequency point of the center RE of the synchronization signal and the frequency point f_low+<NUM> of the closest UE raster position is <NUM> which is less than the half of the subcarrier interval (i.e., <NUM>/<NUM>=<NUM>), the synchronization signal can be found by the UE. f_low is the center frequency point of the physical carrier corresponding to the channel number n=<NUM>. In addition, among the center REs of all synchronization signals, the RE whose index is <NUM> is the closest to the center frequency point of the physical carrier.

Within the subrange of the channel number n of the physical carrier, the difference of the indices x(n) of the center REs of the first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n ≥ <NUM>. That is, |x(n+<NUM>)-x(n)|=Ω, Ω+<NUM> or Ω-<NUM>. Alternatively, |x(n-<NUM>)-x(n)=Ω, Ω+<NUM> or Ω-<NUM>.

When the subcarrier bandwidth (or the subcarrier interval) is <NUM>, P=<NUM>, Q=P/<NUM>=<NUM> and x(<NUM>)=<NUM>, within the channel number interval n∈[<NUM>,Q] (i.e., <NUM>≤n≤Q=<NUM>), the indices of the center REs of the first frequency domain resource sets corresponding to adjacent channel numbers are respectively {<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>}.

Within the channel number interval n∈[Q+m·P+<NUM>·P,Q+(m+<NUM>)·P] (i.e., <NUM>+m*<NUM>+<NUM>≤n≤<NUM>+(m+<NUM>)*<NUM>, where m=<NUM>, <NUM>, <NUM>, and. ), the indices of the center REs of the first frequency domain resource sets corresponding to adjacent channel numbers are respectively {<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>, -<NUM>}.

As shown in <FIG>, for the TDD system, the center frequency point of the physical carrier is located at the channel raster with the channel number n=<NUM>, the UE raster interval is <NUM>, the channel raster interval is <NUM>, and the subcarrier interval is <NUM>. The center frequency point of the physical carrier is f_low+<NUM>. The index of the center RE of the first frequency domain resource set is <NUM>. The first frequency domain resource set is used for mapping the synchronization signal and the broadcast channel. The center RE of the synchronization signal and the center RE of the broadcast channel are the same as the center RE of the first frequency domain resource set. The center frequency point of the synchronization signal and the center frequency point of the broadcast channel are f_low+<NUM>+<NUM>=f_low+<NUM>. The first frequency domain resource set is also used for mapping the channels/the signals in the initial access process other than the synchronization signal and the broadcast channel, where the channels/the signals include the random access channel, the channel carrying the system configuration information (i.e., the system information which is not sent in the broadcast channel), and the channel carrying the second message, the channel carrying the third message and the channel carrying the fourth message in the random access process. The channels described above may be sent at different times.

As shown in <FIG>, for the TDD system, the center frequency point of the physical carrier is located on the channel raster with the channel number n=<NUM>, the UE raster interval is <NUM>, the channel raster interval is <NUM>, and the subcarrier interval is <NUM>. The center frequency point of the physical carrier is f_low+<NUM>. The index of the center RE of the first frequency domain resource set is <NUM>. The first frequency domain resource set is used for mapping the synchronization signal or the broadcast channel. The center RE of the synchronization signal or the center RE of the broadcast channel is the same as the center RE of the first frequency domain resource set. The number of the REs of the first frequency domain resource set is the same as the number of the REs occupied by the synchronization signal or the number of the REs occupied by the broadcast channel. The center frequency point of the synchronization signal or the center frequency point of the broadcast channel is f_low+<NUM>+<NUM>=f_low+<NUM>. The center RE of the second frequency domain resource set is the same as the center RE of the physical carrier. That is, the center frequency point of the second frequency domain resource set is f_low+<NUM>. The second frequency domain resource set is used for mapping the channels/the signals in the initial access process other than the synchronization signal and the broadcast channel, the channels/signals include the random access channel, the channel carrying the system configuration information (i.e., the system information which is not sent in the broadcast channel), and the channel carrying the second message, the channel carrying the third message and the channel carrying the fourth message in the random access process.

In this application example, the third frequency domain resource set is not involved, which may be interpreted to be that the third frequency domain resource set does not exist, or be interpreted to be that the third frequency domain resource set is the same as the second frequency domain resource set. The channels described above may be sent at different times.

As shown in <FIG>, for the FDD system, the center frequency point of the downlink physical carrier is located on the channel raster with the channel number n=<NUM>, the UE raster interval is <NUM>, the channel raster interval is <NUM>, and the subcarrier interval is <NUM>. The center frequency point of the downlink physical carrier is f_low+<NUM>. The index of the center RE of the first frequency domain resource set is <NUM>. The first frequency domain resource set is used for mapping the synchronization signal and the broadcast channel. The center RE of the synchronization signal or the center RE of the broadcast channel is the same as the center RE of the first frequency domain resource set. The center frequency point of the synchronization signal or the center frequency point of the broadcast channel is f_low+<NUM>+<NUM>=f_low+<NUM>. The center RE of the second frequency domain resource set is the same as the center RE of the physical carrier. That is, the center frequency point of the second frequency domain resource set is f_low+<NUM>. The second frequency domain resource set is used for mapping the channels/the signals in the initial access process other than the synchronization signal and the broadcast channel, the channels/the signals include the channel carrying the system configuration information (i.e., the system information which is not sent in the broadcast channel), and the channel carrying the second message and the channel carrying the fourth message in the random access process.

The third frequency domain resource set is located on the uplink physical carrier, used for mapping the random access channel and the third message in the random access process. A fixed offset exists between the center frequency point of the uplink physical carrier and the center frequency point of the downlink physical carrier. The terminal, after detecting the down physical carrier, finds the uplink physical carrier according to the fixed offset. Alternatively, the center frequency point of the uplink physical carrier is notified to the terminal through the system message. The channels described above may be sent at different times.

As shown in <FIG>, for the TDD system, the center frequency point of the physical carrier is located on the channel raster with the channel number n=<NUM>, the UE raster interval is <NUM>, the channel raster interval is <NUM>, and the subcarrier interval is <NUM>. The center frequency point of the physical carrier is f_low+<NUM>. The index of the center RE of the first frequency domain resource set is <NUM>.

The first frequency domain resource set is used for mapping the synchronization signal and the broadcast channel. The center RE of the synchronization signal and the center RE of the broadcast channel are the same as the center RE of the first frequency domain resource set. The synchronization signal and the broadcast channel are sent at different times, that is, in the time division multiplexing mode. The center frequency point of the synchronization signal or the center frequency point of the broadcast channel is f_low+<NUM>+<NUM>=f_low+<NUM>. The number of the REs of the first frequency domain resource set is the equal to the number of the REs occupied by the synchronization signal or the number of the REs occupied by the broadcast channel.

As shown in <FIG>, the first frequency domain resource set is used for mapping the synchronization signal and the broadcast channel. The center RE of the synchronization signal and the center RE of the broadcast channel are the same as the center RE of the first frequency domain resource set. The synchronization signal and the broadcast channel are sent at different times, that is, in the time division multiplexing mode. The number of the REs occupied by the synchronization signal is less than the number of the REs occupied by the broadcast channel. The number of the REs occupied by the first frequency domain resource set is the same as the larger one of the number of REs occupied by the synchronization signal and the number of REs occupied by the broadcast channel (that is, the number of the REs occupied by the first frequency domain resource set is the same as the number of the REs occupied by the broadcast channel). Alternatively, at the time of sending the synchronization signal, the number of the REs occupied by the first frequency domain resource set is the same as the number of the REs occupied by the synchronization signal, while at the time of sending the broadcast channel, the number of the REs occupied by the first frequency domain resource set is the same as the number of the REs occupied by the broadcast channel.

As shown in <FIG>, the first frequency domain resource set is used for mapping the synchronization signal and the broadcast channel. The center RE of the synchronization signal is the same as the center RE of the first frequency domain resource set. The synchronization signal and the broadcast channel are sent at the same time, that is, in the frequency division multiplexing mode.

As shown in <FIG>, for the TDD system, the center frequency point of the physical carrier is located on the channel raster with the channel number n=<NUM>, the UE raster interval is <NUM>, the channel raster interval is <NUM>, and the subcarrier interval is <NUM>. The center frequency point of the physical carrier is f_low+<NUM>.

The physical carrier has two first frequency domain resource sets. The indices of the center REs of these two first frequency domain resources sets are respectively <NUM> and -<NUM>. The first frequency domain resource set is used for mapping the synchronization signal or the broadcast channel. The center RE of the synchronization signal or the center RE of the broadcast channel is the same as the center RE of the corresponding first frequency domain resource set. The number of the REs of the first frequency domain resource set is the same as the number of the REs occupied by the synchronization signal or the broadcast channel corresponding to the first frequency domain resource set. The center frequency points of the synchronization signals of the two first frequency domain resources sets or the center frequency points of the broadcast channels of the two first frequency domain resources sets are respectively f_low+<NUM>+<NUM>=f_low+<NUM> and f_low+<NUM>-<NUM>=f_low kHz. The number of the center REs of the second frequency domain resource set is equal to the number of the center REs of the physical carrier. That is, the center frequency point of the second frequency domain resource set is f_low+<NUM>.

Both of the two first frequency domain resource sets correspond to the second frequency domain resource set. The second frequency domain resource set is used for mapping the channels or the signals in the initial access process other than the synchronization signal and the broadcast channel, the channels or the signals include the random access channel, the channel carrying the system configuration information (i.e., the system information which is not sent in the broadcast channel), and the channel carrying the second message, the channel carrying the third message and the channel carrying the fourth message in the random access process.

The physical carrier has at least one first frequency domain resource set, and the index x(n) of the center RE of the first frequency domain resource set satisfies the following condition: within the subrange of the channel number n of the physical carrier, the absolute value of the difference of the indices of the center REs of first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>, where Ω is a constant, and n≥<NUM>. Specifically, within the subrange of the channel number n of the physical carrier, each channel number may have center REs of multiple possible first frequency domain resources sets, which forms a center RE set of the channel number. It is possible to select an RE from the center RE set of each of the channel numbers in such a manner that the difference of the indices of the center REs of the first frequency domain resource sets corresponding to adjacent physical carrier channel numbers is Ω, Ω+<NUM> or Ω-<NUM>.

For example, for the TDD system, the UE raster interval is <NUM>, the channel raster interval is <NUM>, the subcarrier interval is <NUM>, P=<NUM>, Q=P/<NUM>=<NUM>, and x(<NUM>)=<NUM>. Within the range of the channel number n∈[Q+m·P,Q+(m+<NUM>)·P-<NUM>] (when m=<NUM>, <NUM>≤n≤<NUM>), the center RE set of the multiple possible first frequency domain resource sets of the physical carrier corresponding to the channel number n=<NUM> is {<NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>}.

The center RE set of the multiple possible first frequency domain resource sets of the physical carrier corresponding to the channel number n=<NUM> is {<NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>}.

The center RE set of the multiple possible first frequency domain resource sets of the physical carrier corresponding to the channel number n=<NUM> is {<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>, <NUM>, -<NUM>}.

The center RE <NUM>, the center RE <NUM> and the center RE <NUM> are respectively selected from the center RE set of the physical carrier with the channel number n=<NUM>, the center RE set of the physical carrier with the channel number n=<NUM> and the center RE set of the physical carrier with the channel number n=<NUM>. That is, when Ω=<NUM>, the absolute value of the difference of the indices of the center REs of the first frequency domain resource sets between adjacent channel numbers is Ω(=<NUM>) or Ω-<NUM>(=<NUM>).

Alternatively, the center RE -<NUM>, the center RE -<NUM> and the center RE -<NUM> are respectively selected from the center RE sets of the physical carriers with the channel numbers n=<NUM>, <NUM>, and <NUM>. That is, when Ω=<NUM>, the absolute value of the difference of the indices of the center REs of the first frequency domain resource sets between adjacent channel numbers is Ω (=<NUM>) or Ω-<NUM>(=<NUM>).

The resource set described above is also referred to as a virtual carrier (VC-X). The center resource element (RE) of the resource set may also be referred to as the direct current subcarrier (DC subcarrier) of the VC.

The method embodiment provided in <FIG> of the present application may be executed on a base station, a computer terminal or other similar devices. An example in which the method is executed on the base station is described below. <FIG> is a block diagram of a hardware structure of a base station for implementing the signal sending method according to an embodiment of the present disclosure. As shown in <FIG>, the base station <NUM> may include one or more (only one is shown in <FIG>) processors <NUM> (the processor <NUM> may be, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory <NUM> configured to store data, and a transmission device <NUM> configured to implement a communication function. It should be understood by those skilled in the art that the structure shown in <FIG> is merely illustrative and not intended to limit the structure of the electronic apparatus described above. For example, the base station <NUM> may further include more or less components than the components shown in <FIG>, or has a configuration different from the configuration shown in <FIG>.

The memory <NUM> may be configured to store software programs and modules of application software, such as program instructions/modules corresponding to the signal sending method in the embodiments of the present disclosure. The processor <NUM> is configured to execute the software programs and modules stored in the memory <NUM> to perform functional applications and data processing, that is, to implement the method described above. The memory <NUM> may include a high-speed random access memory, and may further include a nonvolatile memory, such as one or more magnetic storage devices, flash memories or other nonvolatile solid-state memories. In some examples, the memory <NUM> may further include memories that are remotely disposed with respect to the processor <NUM>. These remote memories may be connected to the base station <NUM> via a network. Examples of the network described above include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

The transmission device <NUM> is configured to receive or transmit data via a network. In one example, the transmission device <NUM> may be a radio frequency (RF) module, which is configured to communicate with the Internet in a wireless way.

The method embodiment provided in <FIG> of the present application may be executed on a mobile terminal, a computer terminal or other similar computing devices. An example in which the method is executed on the mobile terminal is described below. <FIG> is a block diagram of a hardware structure of a mobile terminal for implementing the signal receiving method according to an embodiment of the present disclosure. As shown in <FIG>, the mobile terminal <NUM> may include one or more (only one is shown in <FIG>) processors <NUM> (the processor <NUM> may be, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory <NUM> configured to store data, and a transmission device <NUM> configured to implement a communication function. It should be understood by those skilled in the art that the structure shown in <FIG> is merely illustrative and not intended to limit the structure of the electronic apparatus described above. For example, the mobile terminal <NUM> may further include more or fewer components than the components shown in <FIG> or may have a configuration different from the configuration shown in <FIG>.

The memory <NUM> may be configured to store software programs and modules of application software, such as program instructions/modules corresponding to the signal receiving method in the embodiments of the present disclosure. The processor <NUM> is configured to execute the software programs and modules stored in the memory <NUM> to perform functional applications and data processing, that is, to implement the method described above. The memory <NUM> may include a high-speed random access memory, and may further include a nonvolatile memory, such as one or more magnetic storage devices, flash memories or other nonvolatile solid-state memories. In some examples, the memory <NUM> may further include memories that are remotely disposed with respect to the processor <NUM>. These remote memories may be connected to the mobile terminal <NUM> via a network. Examples of the network described above include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

The transmission device <NUM> is configured to receive or transmit data via a network. Specific examples of such a network may include a wireless network provided by a communication provider of the mobile terminal <NUM>. In one example, the transmission device <NUM> includes a network interface controller (NIC), which may be connected to other network devices via a base station, thereby communicating with the Internet. In one example, the transmission device <NUM> may be a radio frequency (RF) module, which is configured to communicate with the Internet in a wireless way.

It will be understood by those skilled in the art that functional modules/units in all or part of the steps of the method, the system and the device disclosed above may be implemented as software, firmware, hardware and appropriate combinations thereof. In the hardware implementation, the division of functional modules/units mentioned in the above description may not correspond to the division of physical units. For example, one physical component may have several functions, or one function or step may be executed jointly by several physical components. Some or all components may be implemented as software executed by processors such as digital signal processors or microcontrollers, hardware, or integrated circuits such as application specific integrated circuits. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium). As is known to those skilled in the art, the term, computer storage media, includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). The computer storage medium includes, but is not limited to, a RAM, a ROM, an EEPROM, a flash memory or other memory technologies, a CD-ROM, a digital versatile disc (DVD) or other optical disc storage, a magnetic cassette, a magnetic tape, a magnetic disk storage or other magnetic storage devices, or any other medium used for storing desired information and accessed by a computer. In addition, as is known to those skilled in the art, communication media generally include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carriers or other transmission mechanisms, and may include any information delivery media.

Claim 1:
A wireless communication method, comprising:
transmitting, from a base station to a terminal, a synchronization signal and a broadcast channel using a first set of resource elements, wherein the first set of resource elements is in a physical carrier, wherein the physical carrier is identified by a channel number of the physical carrier, wherein the channel number of the physical carrier is within a range of channel numbers, and wherein the broadcast channel carries bandwidth information about a second set of resource elements; and
transmitting, by the base station, based on the bandwidth information about the second set of resource elements, information to the terminal using the second set of resource elements,
wherein a first frequency domain index of a center resource element of the first set of resource elements is associated with the channel number of the physical carrier in the range of channel numbers,
wherein the center resource element of the first set of resource elements further corresponds to a second frequency domain index associated with an adjacent carrier identified by a second channel number, and
wherein an absolute value of a difference between the first frequency domain index and the second frequency domain index is a positive constant.