Rmeilan (Syria) (AFP) - Kurdish-led parties are preparing to declare a unified region in areas under their control in northern Syria, representatives said Wednesday, as they push a federal model for governing the country.

The move, which would expand an already existing system of self-administration, is likely to anger Turkey which is wary of any bid by Syrian Kurds to solidify their autonomy and their control of territory.

Kurdish groups appear to be pushing for an alternative solution to Syria's five-year conflict after being excluded from ongoing peace talks in Geneva.

More than 150 delegates from Kurdish, Arab, Assyrian and other parties met Wednesday in the town of Rmeilan, in Syria's northeastern Hasakeh province.

The meeting adjourned in the early evening and will reconvene on Thursday when a decision is expected to be announced, an AFP journalist attending the conference said.

"The gathering will try to develop a new ruling system in northern Syria," said Sihanuk Dibo, a consultant to Syria's leading Kurdish political group, the Democratic Union Party (PYD).

"All the suggestions are now heading towards federalism," he told AFP from the conference.

Delegates proposed "a democratic federation as the only way to guarantee the rights of all people," according to a draft of the proposal obtained by AFP.

"We will decide the borders for these areas and their prerogatives," the draft said.

PYD official Ibrahim Ibrahim said it was a model for the whole of Syria.

"The federal system in northern Syria is a part of what we consider a necessity to adopt a federal system in all Syria one day," he said.

In such a scenario, he said, "a new constitution will determine the relation between the federal districts and the centre in Damascus."

- System 'for all Syria' -

Sheikh Hamad Shehade, the head of an Arab tribe in Rojava, agreed, saying: "The federal system is not only for northern Syria but for all Syria.

"The objective is not to divide the Syrian territories, and we started with this initiative (in northern Syria) hoping that it will prevail in all Syria," he told AFP.

Kurdish parties already operate a system of three "autonomous administrations" in Syria's north, with independent police forces and schools.

The three cantons run along Syria's northern border with Turkey and are known as Afrin and Kobane, both in Aleppo province, and Jazire in Hasakeh province.

As well as three cantons, the plan would see the federal system expand to include additional areas recently seized from the Islamic State jihadist group in northern and northeastern Syria, Kurdish officials said.

Officials said the announcement was not intended as a first step towards independence.

"A federal state for ruling all of Syria is the best way to protect Syria from being divided up, because there is major distrust among the different sides," said Ibrahim.

- A political message -

Washington-based analyst Mutlu Civiroglu said the announcement would be a political message "from Syrians on the ground, politically and militarily".

"Politically, it's also a message to the United Nations, the US, Russia, and especially to Geneva, that if you ignore us, we are going to determine our future by ourselves," he told AFP.

Despite deep divisions, the opposition High Negotiations Committee and the embattled government in Damascus have both categorically rejected a federal system in Syria.

On Wednesday, the head of the government delegation to the peace talks, Bashar al-Jaafari, told reporters in Geneva that announcing a federation would be "a total failure".

"The Syrian Kurds are an important component of the Syrian people... So betting on creating any kind of divisions among the Syrians will be a total failure," he said.

The issue of Syria's Kurds has caused a rare rift between the United States and NATO ally Turkey, which is battling a decades-long insurgency led by the outlawed Kurdistan Workers' Party (PKK).

Turkey has shelled the main Kurdish militia across the border, the People's Protection Units (YPG), but the United States has cooperated with the group, which has emerged as a key force fighting IS.

"Syria's national unity and territorial integrity is essential," a Turkish diplomatic source in Ankara told AFP.

He said the Syrian people would "decide collectively" on the future governance of their country.

"Except for that, unilateral initiatives cannot be valid," he said.