Accessing a cell utilizing a multiple beam network

A method performed by a wireless device for detecting a primary synchronization signal (PSS) and an associated information message sent by a network node for synchronization of the wireless device with the network node, the network node and the wireless device operating in a wireless communications network, the method comprising:

• detecting the primary synchronization signal, wherein the primary synchronization signal has been sent by the network node in a different beam in each of N Orthogonal Frequency Division Multiplexing (OFDM) symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols, wherein N is equal to or larger than 2;
• detecting the associated information message at a pre-defined time and frequency position, which pre-defined time and frequency position is relative to the time and frequency position of the detected primary synchronization signal;
• obtaining subframe timing and frame timing relative to the pre-defined time by detecting an index comprised in the associated information message, wherein the index comprises a different index for each of a plurality of different beams;
• and
• acquiring at least a subframe synchronization using a pre-defined mapping between the different index and a related position of the OFDM symbol and subframe boundaries to acquire a relative distance to the subframe boundaries and the OFDM symbol associated with the primary synchronization signal detected.

A network node configured to send to a wireless device a primary synchronization signal and an associated information message, for synchronization of the wireless device with the network node, the network node and the wireless device being configured to operate in a wireless communications network, the network node comprising:

• at least one processor;
• and
• a memory storing instructions which, when executed by the processor causes the network node to:
• send, using a sending port, the primary synchronization signal in a different beam in each of N Orthogonal Frequency Division Multiplexing (OFDM) symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols, wherein N is equal to or larger than 2;
• and
• for each sending of the primary synchronization signal in a different beam, send, using the sending port, an associated information message at a pre-defined time and frequency position in an OFDM symbol, which pre-defined time and frequency position is relative to the time and frequency position of the primary synchronization signal, wherein the associated information message comprises an index, and wherein a subframe timing and a frame timing relative to the pre-defined time are obtainable by the wireless device by detecting the index, wherein sending the associated information message at the pre-defined time and frequency position in the OFDM symbol comprises sending a different index for a plurality of the sending of the primary synchronization signal in a different beam, wherein at least a subframe synchronization is obtainable by the wireless device by using a pre-defined mapping between the different index and a related position of the OFDM symbol and subframe boundaries.

A wireless device configured to detect a primary synchronization signal and an associated information message configured to be sent by a network node, for synchronization of the wireless device with the network node, the network node and the wireless device being configured to operate in a wireless communications network, the wireless device comprising:

• at least one processor;
• and
• a memory storing instructions which, when executed by the processor causes the wireless device to:
• detect the primary synchronization signal, wherein the primary synchronization signal is configured to have been sent by the network node in a different beam in each of N Orthogonal Frequency Division Multiplexing (OFDM) symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols, wherein N is equal to or larger than 2;
• detect the associated information message at a pre-defined time and frequency position, which pre-defined time and frequency position is relative to the time and frequency position of the detected primary synchronization signal;
• obtain subframe timing and frame timing relative to the pre-defined time by detecting an index comprised in the associated information message, wherein the index comprises a different index for each of a plurality of different beams;
• and
• acquiring at least a subframe synchronization using a pre-defined mapping between the different index and a related position of the OFDM symbol and subframe boundaries to acquire a relative distance to the subframe boundaries and the OFDM symbol associated with the primary synchronization signal detected.

A method performed by a wireless device for detecting a primary synchronization signal (PSS) and an associated information message sent by a network node for synchronization of the wireless device with the network node, the network node and the wireless device operating in a wireless communications network, the method comprising:

• detecting the primary synchronization signal, wherein the primary synchronization signal has been sent by the network node in a different beam in each of N Orthogonal Frequency Division Multiplexing (OFDM) symbols within a subframe, at least once in a time and frequency position in every one of the N OFDM symbols, wherein N is equal to or larger than 2;
• detecting the associated information message at a pre-defined time and frequency position, which pre-defined time and frequency position is relative to the time and frequency position of the detected primary synchronization signal;
• obtaining subframe timing and frame timing relative to the pre-defined time by detecting an index comprised in the associated information message;
• responsive to detecting the primary synchronization signal in more than one of the N OFDM symbols, determining which one of the more than one OFDM symbol comprises a primary synchronization signal detected with a highest receive quality;
• and
• using the one of the more than one OFDM symbol when obtaining the subframe timing and frame timing.